She's no hard leftist (7)

I believe the answer is:

mildred

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

'no hard leftist' is the wordplay.
'no hard' becomes 'mild' (I am not sure about this - if you are sure you should believe this answer much more).
'leftist' becomes 'red' (red can informally mean communist).
'mild'+'red'='MILDRED'

Can you help me to learn more?

(Other definitions for mildred that I've seen before include "Woman" , "Girl" , "lady?" .)

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

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