Unfortunately trims cash for annual celebration (9)
I believe the answer is:
christmas
'annual celebration' is the definition.
'unfortunately trims cash' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'trims'+'cash'='trimscash'
'trimscash' anagrammed gives 'CHRISTMAS'.
'for' acts as a link.
(Other definitions for christmas that I've seen before include "See 14 Across" , "- box; - tree" , "SECOND PART OF 1 ACROSS" , "and 24 Down: Last day of Advent calendar" , "Christian festival" .)