Crossword Genius

A mother? He didn't have one! (4)

Ross

I believe the answer is:

adam

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'he didn't have one' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

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

Can you help me to learn more?

(Other definitions for adam that I've seen before include "Faith, for example" , "who was tempted by mate?" , "First man in the Bible" , "the first orphan?" , "man expelled from garden" .)

I've seen this clue in The Sun.
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