She's of little capacity in legal matters (3)

I believe the answer is:

gal

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'she's of little capacity' is the definition.
I can't tell whether this defines the answer.

'in legal matters' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GAL' is hidden in the letters of 'legal matters'.

Can you help me to learn more?

(Other definitions for gal that I've seen before include "Girl from American west" , "An American girl, cowboy vintage" , "Lass" , "Young woman (colloq.)" , "Lady" .)

I've seen this clue in the Evening Standard.

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