Perhaps slip up providing supplier of berries (7)
I believe the answer is:
fielder
'perhaps slip' is the definition.
'fielder' can be an answer for 'slip' (I've seen this before). I'm unsure of the 'perhaps' bit.
'up providing supplier of berries' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'providing' becomes 'if' (eg 'providing it's sunny' means 'if it's sunny').
'supplier of berries' becomes 'elder' (I can't explain this - if you can you should give a lot more credence to this answer).
'if' backwards is 'fi'.
'fi'+'elder'='FIELDER'
Can you help me to learn more?
(Other definitions for fielder that I've seen before include "cover, perhaps" , "Slip or cover, maybe" , "Slip, perhaps" , "he might be in a silly position" , "Player" .)