Crossword Genius

It's not possible to have a party without toilet facilities? (2,3,2)

Ross

I believe the answer is:

no can do

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

'it's not possible' is the definition.
(I've seen this in another clue)

'a party without toilet facilities?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
'party' could be 'do' (do is a kind of party) and 'do' is found in the answer.
'without' could be 'no' and 'no' is found in the answer.
A single letter 'c' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'to have' is the link.

Can you help me to learn more?

(Other definitions for no can do that I've seen before include "off-putting response" , "Absolutely not!" , "Impossible, I'm afraid!" , "Unable to help" , "Nothing manageable" .)

I've seen this clue in The Times.
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