She's a lady at heart (6)

I believe the answer is:

gladys

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

I don't understand the rest of the clue.

(Other definitions for gladys that I've seen before include "Lady's name" , "- Knight and the Pips (Motown)" , "- Cooper, Eng. actress" , "Girl's name" , "Female name" .)

I've seen this clue in The Globe and Mail.

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