Alley pickup (5)
I believe the answer is:
spare
'alley pickup' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spare that I've seen before include "Pardon; unneeded" , "Thin; elegantly simple" , "Thin; left over" , "Surplus to requirements" , "Excess to requirements" .)