Protocol laboratories will show fellow worker (12)

I believe the answer is:

collaborator

'fellow worker' is the definition.
(I've seen this before)

'protocol laboratories will show' is the wordplay.
'will show' says the answer is hidden in the clue.
'COLLABORATOR' can be found hidden inside 'protocol laboratories'.

(Other definitions for collaborator that I've seen before include "Fellow-worker" , "Quisling" , "Fellow worker" , "Partner" , "who takes part in jobshare?" .)

I've seen this clue in The Times.

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