Crossword Genius

Caller has prisoner finally freed from nick (5)

Ross

I believe the answer is:

bugle

'caller' is the definition.
(a bugle is used for military calls)

I don't understand the remainder of the clue.

(Other definitions for bugle that I've seen before include "ornament for dress" , "Bit of brass" , "costume ornament?" , "Instrument used for military signals" , "Mil. trumpet" .)

I've seen this clue in The Guardian.
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