Crossword Genius

Old soldier your pet may not like very much (3)

Ross

I believe the answer is:

vet

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'old soldier' is the definition.
(I've seen this in other clues)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for vet that I've seen before include "Screen" , "Experienced" , "animal doctor to > investigate" , "Check someone for suitability" , "Animal doctor, in brief" .)

I've seen this clue in the Evening Standard.
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