The cash I had for cover (3)
I believe the answer is:
'for cover' is the definition.
(lid is a kind of cover)
'the cash i had' is the wordplay.
'the cash' becomes 'L' (The pound sterling symbol is an elaborate L).
'i had' becomes 'i'd' (I'd).
(Other definitions for lid that I've seen before include "Cap or top for container" , "Cover for box or eye" , "Movable cover" , "Cover as for jar" , "Cover for box or pot" .)