Fe-female PM (4,4)

I believe the answer is:

iron lady

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'pm' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'fe-female' is the wordplay.
'fe' becomes 'iron' (synonyms).
'female' becomes 'lady' (lady is a kind of female).
'iron'+'lady'='IRON LADY'

Can you help me to learn more?

(Other definitions for iron lady that I've seen before include "The one who was "not for turning"" , "at No 10, once?" .)

I've seen this clue in The Guardian.

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