Crossword Genius

Partakes of, when one is forced to (3)

Ross

I believe the answer is:

has

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

'partakes of' is the definition.
(I've seen this in another clue)

'when one is forced to' is the wordplay.
I cannot really understand how this works, but
'when' could be 'as' (eg 'when I walked' means 'as I walked') and 'as' is found in the answer.
A single letter 'h' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for has that I've seen before include "Contains" , "Cheats" , "Bears" , "Possesses or owns" , "Gives birth to" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app