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Monkey doctor holding limb firm (8)

Ross

I believe the answer is:

marmoset

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

This clue could be a double definition.

'monkey' is the first definition.
(I know that marmoset is a type of New World monkey)

'doctor holding limb firm' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Other definitions for marmoset that I've seen before include "Small monkey - Rome's mat (anag)" , "Small tropical American monkey" , "Small bushy-tailed monkey" , "Star memo about kind of monkey" , "Turn morse mat over for the monkey" .)

I've seen this clue in The Telegraph and The Sun.
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