Fish for any number stored in shed (4)
I believe the answer is:
Here is my best explanation:
'fish for' is the definition.
'any number stored in shed' is the wordplay.
'any number' becomes 'n' (I've seen this in other clues).
'stored in' is an insertion indicator.
'shed' becomes 'hut' (I've seen this before).
'n' put inside 'hut' is 'HUNT'.