Street groove causing swaggering walk (5)
I believe the answer is:
strut
'swaggering walk' is the definition.
(I've seen this in another clue)
'street groove' is the wordplay.
'street' becomes 'st' (abbreviation).
'groove' becomes 'rut' (synonyms).
'st'+'rut'='STRUT'
'causing' acts as a link.
(Other definitions for strut that I've seen before include "Walk arrogantly" , "Swagger; bracing bar" , "Take vain steps" , "Walk proudly like metal support" , "Move stiffly" .)