Bicycle caught in traffic? (6)
I believe the answer is:
peddle
'traffic?' is the definition.
(I've seen this before)
'bicycle caught' is the wordplay.
'bicycle' becomes 'pedal' (synonyms).
'caught' shows a homophone (sound like) (to catch something can mean to hear it).
'pedal' is a homophone of 'PEDDLE'.
'in' is the link.
(Other definitions for peddle that I've seen before include "Hawk, sell" , "Travelling salesman does!" , "push" , "Deal in drugs" , "Sell (drugs or something hot?)" .)