Crossword Genius

Troll drawing in young lady’s a beast (7)

Ross

I believe the answer is:

hamster

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

'a beast' is the definition.
(hamster is a kind of beast)

'troll drawing in young lady's' is the wordplay.
I cannot quite see how this works, but
'lady' could be 'ms' (alternative to Miss or Mrs) and 'ms' is found within the answer.
The remaining letters 'hater' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for hamster that I've seen before include "Animal" , "one running round in circles?" , "Small pet rodent with pouched cheeks" , "Rodent often kept as pet" , "Common pet rodent" .)

I've seen this clue in The Sunday Times.
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