Lass of frugality (3)

I believe the answer is:

gal

'lass' is the definition.
(I've seen this before)

'of frugality' is the wordplay.
'of' indicates a hidden word.
'GAL' is hidden within 'frugality'.

(Other definitions for gal that I've seen before include "female noted in Kalamazoo" , "miss" , "Girl from American west" , "Lady" , "Lass" .)

I've seen this clue in The Mirror.

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