Crossword Genius

Source of first introduction that rhymes? (4)

Ross

I believe the answer is:

adam

This might be a double definition.

'source' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'first introduction that rhymes?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
I also know that 'first' relates to this answer.

'of' acts as a link.

(Other definitions for adam that I've seen before include "Eden man" , "Biblical progenitor of human race" , "One of our common ancestors?" , "- - Bede by George Eliot" , "the first orphan?" .)

I've seen this clue in The Guardian.
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