Crossword Genius

See people, not initially for sex (10)

Ross

I believe the answer is:

copulation

'for sex' is the definition.
(copulation is a kind of sex)

'see people not initially' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'people' becomes 'population'.
'not initially' means to remove the first letter.
'population' with its first letter taken off is 'opulation'.
'c'+'opulation'='COPULATION'

I've seen this clue in The Guardian.
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