Enjoyable diversions drained financial resources (5)
I believe the answer is:
funds
'financial resources' is the definition.
(I've seen this in another clue)
'enjoyable diversions drained' is the wordplay.
'enjoyable' becomes 'fun' (fun means enjoyable or pleasing).
'diversions' becomes 'dips' (dip is a kind of diversion).
'drained' suggests removing the centre.
'dips' with its middle taken out is 'ds'.
'fun'+'ds'='FUNDS'
(Other definitions for funds that I've seen before include "Finances" , "Available cash" , "Liquid assets" .)