Reprimand headless chicken? (6)
I believe the answer is:
earful
'reprimand' is the definition.
(earful is a kind of reprimand)
'headless chicken?' is the wordplay.
'headless' means to remove the first letter.
'chicken?' becomes 'fearful' (similar in meaning).
'fearful' with its first letter taken away is 'EARFUL'.
(Other definitions for earful that I've seen before include "Prolonged reprimand (colloq.)" , "Informally, a strong reprimand of aural content" , "A scolding (sl.)" , "Spoken reprimand" , "Ale fur (anag.)" .)