So Poles are all male (4)

I believe the answer is:

sons

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'so poles are all male' is the definition.
I can't judge whether this definition defines the answer.

'so poles' is the wordplay.
'poles' becomes 'ns' (North and South poles).
'so'+'ns'='SONS'

Can you help me to learn more?

(Other definitions for sons that I've seen before include "Male offspring" , "DH Lawrence novel: __ and Lovers" .)

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

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