Crossword Genius

A gun hidden in peach trifle (9)

Ross

I believe the answer is:

bagatelle

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

'a gun hidden in peach' is the wordplay.
'gun' becomes 'gat' (gat is a kind of gun).
'hidden in' indicates putting letters inside.
'peach' becomes 'belle' (I can't justify this - if you can you should believe this answer much more).
'a'+'gat'='agat'
'agat' put within 'belle' is 'BAGATELLE'.

Can you help me to learn more?

(Other definitions for bagatelle that I've seen before include "Musical item" , "Something trivial" , "Unimportant thing" , "drop in the ocean!" , "Board game - trifle" .)

I've seen this clue in The Telegraph.
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