Imperfect: a little repulsive (11)

I believe the answer is:

unwholesome

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

'repulsive' is the definition.
(thesaurus)

'imperfect a little' is the wordplay.
I cannot quite see how this works, but
'little' could be 'some' (similar in meaning) and 'some' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for unwholesome that I've seen before include "Tainted" , "Morally harmful" .)

I've seen this clue in The Times.

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