Stone used in bagatelle (5)

I believe the answer is:

agate

'stone' is the definition.
(agate is a type of stone)

'in bagatelle' is the wordplay.
'in' indicates the answer is hidden within the clue.
'AGATE' can be found hidden inside 'bagatelle'.

'used' acts as a link.

(Other definitions for agate that I've seen before include "Impure form of quartz with banded chalcedony, used as a gemstone" , "rock with bands" , "Banded ornamental stone" , "Striped stone" , "Old drama critic" .)

I've seen this clue in The Globe and Mail.

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