Crossword Genius

Complain constantly of a horse (3)

Ross

I believe the answer is:

nag

This clue is a double definition.

'complain constantly' is the first definition.
(I've seen this in another clue)

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

'of' acts as a link.

(Other definitions for nag that I've seen before include "Complain, worry" , "(Of pain) ache dully; horse (colloq.)" , "Badger continually like old horse" , "Old or over-worked horse" , "Mount" .)

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