So he had a mother! (4)

I believe the answer is:

adam

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'so he' is the definition.
'Adam' can be an answer for 'he'. I am not certain of the 'so' bit.

'a mother' is the wordplay.
'mother' becomes 'dam' (female parent of an animal).
'a'+'dam'='ADAM'

'had' is the link.

Can you help me to learn more?

(Other definitions for adam that I've seen before include "God's first son" , "who transformed Palladian architecture?" , "father figure" , "Fellow" , "Eden man" .)

I've seen this clue in the Evening Standard.

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