Street hip-hop beat (5)
I believe the answer is:
strap
'beat' is the definition.
(I know that beat is the is a more specific form of the action of strap.)
'street hip-hop' is the wordplay.
'street' becomes 'st' (abbreviation).
'hip-hop' becomes 'rap' (I've seen this in another clue).
'st'+'rap'='STRAP'
(Other definitions for strap that I've seen before include "Parts of a leather band" , "Security device" , "Leather fastening" , "e.g. Belt" , "something to hang on to" .)