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Wherein, experimentally, to have a little party? (3)

Ross

I believe the answer is:

lab

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

'party?' is the definition.
(abbreviation for Labour, UK political party)

'wherein experimentally to have a little' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
'little' could be 'l' (abbreviation for little) and 'l' is found within the answer.
A single letter 'b' 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 lab that I've seen before include "Scientists' workplace" , "Science room" , "Research workroom" , "In brief, a room for scientific experiments" , "Workplace for researcher" .)

I've seen this clue in the Evening Standard.
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