Crossword Genius

Horse is worry, constantly (3)

Ross

I believe the answer is:

nag

This clue is a double definition.

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

'worry constantly' is the second definition.
(I've seen this before)

'is' is the link.

(Other definitions for nag that I've seen before include "Equine" , "Persistently worry; horse" , "Hack" , "(Of pain) ache dully; horse (colloq.)" , "Keep worrying" .)

I've seen this clue in The Times.
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