We are displaying the solving process step by step in case you need to clarify some unsolvable piece.
Solving Steps
1 [companion of PB at lunch] is replaced by 'J'
2 [it's satisfying when dropped (by a DJ perhaps)] is replaced by 'beat'
3 [out of practice] is replaced by 'rusty'
4 [Bozo or Krusty, e.g.] is replaced by 'clown'
5 [one might have a president or a clown 🤡] is replaced by 'class'
6 [class frequently invoked by politicians] is replaced by 'middle'
7 [result of using a comb (e.g. middle or side)] is replaced by 'part'
8 [something to beat with an early departure] is replaced by 'traffic'
9 ["I don’t trust atoms—they make up everything", e.g.] is replaced by 'pun'
10 [something spun by a spider] is replaced by 'Web'
11 [scope of a certain Wide Web] is replaced by 'world'
12 [🥊 knock ➡️ ___ ⬅️ of this world 🌎] is replaced by 'out'
13 [deep meditation might cause you to have an experience out of it 😵💫] is replaced by 'body'
14 [envelope contents ✉️] is replaced by 'letter'
15 [body part that sounds like a letter that, from my perspective, means another letter, twelve after the first] is replaced by 'Eye'
16 [city with an Eye 🎡] is replaced by 'London'
2 [it's satisfying when dropped (by a DJ perhaps)] is replaced by 'beat'
3 [out of practice] is replaced by 'rusty'
4 [Bozo or Krusty, e.g.] is replaced by 'clown'
5 [one might have a president or a clown 🤡] is replaced by 'class'
6 [class frequently invoked by politicians] is replaced by 'middle'
7 [result of using a comb (e.g. middle or side)] is replaced by 'part'
8 [something to beat with an early departure] is replaced by 'traffic'
9 ["I don’t trust atoms—they make up everything", e.g.] is replaced by 'pun'
10 [something spun by a spider] is replaced by 'Web'
11 [scope of a certain Wide Web] is replaced by 'world'
12 [🥊 knock ➡️ ___ ⬅️ of this world 🌎] is replaced by 'out'
13 [deep meditation might cause you to have an experience out of it 😵💫] is replaced by 'body'
14 [envelope contents ✉️] is replaced by 'letter'
15 [body part that sounds like a letter that, from my perspective, means another letter, twelve after the first] is replaced by 'Eye'
16 [city with an Eye 🎡] is replaced by 'London'
The Answer
the first traffic lights are installed in London
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