Crossword Genius

Points to unknown biological characteristic (3)

Ross

I believe the answer is:

sex

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

'biological characteristic' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'points to unknown' is the wordplay.
'points' becomes 'se'.
'to unknown' becomes 'x' (algebra).
'se'+'x'='SEX'

Can you help me to learn more?

(Other definitions for sex that I've seen before include "VI (Lat.); m. or f." , "Gender" , "Expert in the treatment of coital problems" , "Hanky-panky" , "Male or female" .)

I've seen this clue in the Evening Standard.
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