Crossword Genius

Warning bolshie, loud prisoner (3,4)

Ross

I believe the answer is:

red flag

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

'bolshie loud prisoner' is the wordplay.
'bolshie' becomes 'red'.
'loud' becomes 'f' (short for forte - 'loud' in music).
'prisoner' becomes 'lag' (I've seen this before).
'red'+'f'+'lag'='RED FLAG'

(Other definitions for red flag that I've seen before include "The ... ..., anthem of the British Labour Party" , "That should make you careful!" , "A number of revolutionaries" , "Emblem of socialist revolution or danger" , "Warning to stop" .)

I've seen this clue in The Telegraph.
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