Caught a veterinary surgeon hiding a warning (6)

I believe the answer is:

caveat

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'warning' is the definition.
(I know that caveat is a type of warning)

'caught a veterinary surgeon hiding a' is the wordplay.
'caught a veterinary' becomes 'ca' (I can't justify this - if you can you should give a lot more credence to this answer).
'surgeon' becomes 'vet' (veterinary surgeon).
'hiding' is an insertion indicator.
'vet' going around 'a' is 'veat'.
'ca'+'veat'='CAVEAT'

Can you help me to learn more?

(Other definitions for caveat that I've seen before include "Reservation" , "Let the buyer beware ...emptor" , "Formal warning" , "Warning (of conditions)" , "Warning in a legal document" .)

I've seen this clue in The Times.

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