State secrets held in British workshop? (4)
I believe the answer is:
blab
'state secrets' is the definition.
(to blab is to reveal or state a secret)
'british workshop?' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'workshop?' becomes 'lab' (I've seen this in another clue).
'b'+'lab'='BLAB'
'held in' is the link.
(Other definitions for blab that I've seen before include "Let slip" , "Reveal secrets by indiscreet talk (colloq.)" , "Let the cat out of the bag" , "Talk indiscreetly" , "Reveal indiscreetly" .)