Crossword Genius

Not our party? (3)

Ross

I believe the answer is:

lab

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'not our party?' is the definition.
I can't tell whether this defines the answer.

'not our party?' is the wordplay.
'not' indicates named letters should be taken away.
'party?' becomes 'labour' (Labour Party is an example).
'labour' with 'our' removed is 'LAB'.

Can you help me to learn more?

(Other definitions for lab that I've seen before include "Workplace for scientific research, in short" , "Scientific research space, in short" , "Scientist's workroom" , "Room for scientist" , "SECOND PART OF 15" .)

I've seen this clue in the Evening Standard.
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