Robbed some poor lamb? (7)

I believe the answer is:

fleeced

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'robbed' is the definition.
('fleece' can be a synonym of 'rob')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fleeced that I've seen before include "Took coat off" , "Robbed by trickery, like sheep" , "Shorn" , "Swindled" , "like Jacob?" .)

I've seen this clue in the Evening Standard.

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