Big money for new gear (5)
I believe the answer is:
large
'big' is the definition.
(I know that big can be written as large)
'money for new gear' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'for' means one lot of letters go next to another.
'new' is an anagram indicator.
'gear' is an anagram of 'arge'.
'l'+'arge'='LARGE'
(Other definitions for large that I've seen before include "Big, outsize" , "substantial" , "Chunky" , "Generous" , "Immense" .)