Crossword Genius

Son, mine, an exact likeness (4)

Ross

I believe the answer is:

spit

I'm a little stuck... Click here to teach me more about this clue!

'an exact likeness' is the definition.
'spit' can be an answer for 'likeness' (thesaurus). I am unsure of the 'an exact' bit.

'son mine' is the wordplay.
'son' becomes 's'.
'mine' becomes 'pit' (down the pit).
's'+'pit'='SPIT'

Can you help me to learn more?

(Other definitions for spit that I've seen before include "Rod used for roasting meat" , "Be furious" , "double, perhaps" , "A spade's depth, in earth" , "nearly a foot deep" .)

I've seen this clue in The Sun.
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