Badger in barn again (3)
I believe the answer is:
nag
'badger' is the definition.
(I've seen this in another clue)
'in barn again' is the wordplay.
'in' indicates the answer is hidden within the clue.
'NAG' is hidden within 'barn again'.
(Other definitions for nag that I've seen before include "Old or over-worked horse" , "(Of pain) ache dully; horse (colloq.)" , "Find fault" , "Complaint" , "Scold; inferior horse" .)