Father's not French! (3)

I believe the answer is:

pas

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'father's not french' is the definition.
I can't tell whether this defines the answer.

'father's not french' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'not french' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'pa'+'s'='PAS'

Can you help me to learn more?

(Other definitions for pas that I've seen before include "Dance movement" , "Dancing step" , "... de deux, ballet step for two" , "Dance step" , "Type of sausage" .)

I've seen this clue in the Evening Standard.

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