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 "father figure", "__ Smith, author of The Wealth of Nations", "Male", "the first orphan?", "Eve's partner".)

I've seen this clue in Sydney Morning Herald.
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