Crossword Genius

First guy to be a mother (4)

Ross

I believe the answer is:

adam

'first guy' is the definition.
(I've seen this before)

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

'to be' acts as a link.

(Other definitions for adam that I've seen before include "According to the Bible, progenitor of the human race" , "God's first son" , "Biblical first man" , "one might confuse with total stranger" , "- - Bede by George Eliot" .)

I've seen this clue in the Sydney Morning Herald.
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