Blame cheap mixture for fruity dessert (5,5)
I believe the answer is:
peach melba
'fruity dessert' is the definition.
(I've seen this before)
'blame cheap mixture' is the wordplay.
'mixture' indicates anagramming the letters.
'blame'+'cheap'='blamecheap'
'blamecheap' with letters rearranged gives 'PEACH MELBA'.
'for' acts as a link.
(Other definitions for peach melba that I've seen before include "Ice cream dish with fruit" , "Dame Nellie's dish" , "Sweet" , "fruity dessert" .)