Hollow cave on end of street (4)
I believe the answer is:
dent
'hollow' is the definition.
(I've seen this before)
'cave on end of street' is the wordplay.
'cave' becomes 'den' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'end of' says to take the final letters.
The last letter of 'street' is 't'.
'den'+'t'='DENT'
(Other definitions for dent that I've seen before include "Slight damage" , "Hollow caused by a blow" , "Small hollow" , "Impression left by impact" , "Tend (anag.)" .)