Shopping fling (5)
I believe the answer is:
spree
'shopping fling' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for spree that I've seen before include "Bout of indulgence" , "Wild spell of spending or drinking" , "Merry frolic" , "Fling - Berlin's river" , "Drunken bout" .)