Crossword Genius

Reserved fiends in Turin vet a cast (15)

Ross

I believe the answer is:

undemonstrative

I'm a little stuck... Click here to teach me more about this clue!

'reserved' is the definition.
(similar in meaning)

'fiends in turin vet a cast' is the wordplay.
I cannot quite see how this works, but
'fiends' could be 'demons' ('demon' can be a synonym of 'fiend') and 'demons' is found in the answer.
'a' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for undemonstrative that I've seen is " Cold".)

I've seen this clue in The Daily Express.
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