Ohio wife punches one shouting "more chicken!" (8)
I believe the answer is:
yellower
'more chicken' is the definition.
(yellow can mean frightened or chicken)
'ohio wife punches one shouting' is the wordplay.
'ohio' becomes 'o'.
'wife' becomes 'w' (abbreviation).
'punches' means one lot of letters goes inside another (some letters punch a hole in others).
'one shouting' becomes 'yeller' (someone shouting or yelling out).
'o'+'w'='ow'
'ow' placed inside 'yeller' is 'YELLOWER'.
(Other definitions for yellower that I've seen before include "more cowardly" , "More jaundiced" .)