Any item spoiling useful facility (7)
I believe the answer is:
amenity
'useful facility' is the definition.
(I've seen this before)
'any item spoiling' is the wordplay.
'spoiling' indicates anagramming the letters.
'any'+'item'='anyitem'
'anyitem' anagrammed gives 'AMENITY'.
(Other definitions for amenity that I've seen before include "Item provided to make life easier" , "Any item (anag.)" , "Anytime (anag.)" , "Convenience - any time (anag)" , "Facility, useful feature" .)