Crossword Genius

Horse brought up to snare bird (6)

Ross

I believe the answer is:

gannet

'bird' is the definition.
(gannet is a kind of bird)

'horse brought up to snare' is the wordplay.
'horse' becomes 'nag' (term for an old horse).
'brought up' shows that the letters should be reversed in order (in a down clue, letters go up).
'to snare' becomes 'net' (I've seen this in another clue).
'nag' written backwards gives 'gan'.
'gan'+'net'='GANNET'

(Other definitions for gannet that I've seen before include "Large diving fish" , "guzzler?" , "Large fish-eating bird" , "Gluttonous type" , "greedy type" .)

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