First of cops on track for Bow Street? (8)
I believe the answer is:
crescent
'bow street?' is the definition.
'crescent' can be an answer for 'street?' (I've seen this before). I'm not certain of the 'bow' bit.
'first of cops on track' is the wordplay.
'first of cops' becomes 'c' (1st letter of 'cops').
'on' becomes 're' ('on' can be mean 'with reference to').
'track' becomes 'scent'.
'c'+'re'+'scent'='CRESCENT'
'for' is the link.
Can you help me to learn more?
(Other definitions for crescent that I've seen before include "Shape of waxing or waning moon" , "Sickle-shape" , "Way" , "Curved row of houses" , "Young moon shape" .)