Crossword Genius

Horse in barn again (3)

Ross

I believe the answer is:

nag

'horse' is the definition.
(term for an old horse)

'in barn again' is the wordplay.
'in' indicates a hidden word.
'NAG' can be found hidden inside 'barn again'.

(Other definitions for nag that I've seen before include "Worry constantly" , "Old or over-worked horse" , "Keep worrying" , "Hack" , "Constant worrier" .)

I've seen this clue in The Sun.
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