Crossword Genius

Not all isolated? (5)

Ross

I believe the answer is:

apart

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

'isolated?' is the definition.
(I know that isolated can be written as apart)

'not all' is the wordplay.
I cannot really understand how this works, but
'not all' could be 'part' ('part' is the opposite to 'all') and 'part' is present in the answer.
A single letter 'a' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for apart that I've seen before include "aloof" , "Separated physically" , "Estranged - in pieces" , "Independently" , "Separated or at a distance" .)

I've seen this clue in The Globe and Mail.
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