Baster ruined serving of chicken (6)
I believe the answer is:
breast
'serving of chicken' is the definition.
'baster ruined' is the wordplay.
'ruined' indicates an anagram.
'baster' anagrammed gives 'BREAST'.
(Other definitions for breast that I've seen before include "Upper front part of the human torso" , "Mamma" , "Bosom" , "Part of a jacket" , "Front of the trunk" .)