The animal is, though small, adroit (5)

I believe the answer is:

sable

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'the animal' is the definition.
(thesaurus)

'though small adroit' is the wordplay.
'though small' becomes 's' (abbreviation - e.g. clothes size. I am not sure about the 'though' bit.).
'adroit' becomes 'able' (I've seen this in another clue).
's'+'able'='SABLE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for sable that I've seen before include "Black; antelope" , "Brush" , "fur coat" , "North Asian marten" , "Literary black" .)

I've seen this clue in the Evening Standard.

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