Chicken RAF cooked to help (6)
I believe the answer is:
afraid
'chicken' is the definition.
(I've seen this in another clue)
'raf cooked to help' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'to help' becomes 'aid' ('aid' can be a synonym of 'help').
'raf' is an anagram of 'afr'.
'afr'+'aid'='AFRAID'
(Other definitions for afraid that I've seen before include "cowardly" , "Alarmed, fearful" , "feeling scared" , "Nervous" , "Filled with concern" .)