Crossword Genius

Fixing a bell outside the entrance is of little importance (9)

Ross

I believe the answer is:

bagatelle

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'of little importance' is the definition.
The definition suggests a singular noun which matches the answer.

'fixing a bell outside the entrance' is the wordplay.
'fixing' indicates anagramming the letters.
'outside' is an insertion indicator.
'the entrance' becomes 'gate' (I've seen this before).
'a'+'bell'='abell'
'abell' with letters rearranged gives 'balle'.
'balle' going around 'gate' is 'BAGATELLE'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for bagatelle that I've seen before include "lovely trinket" , "no serious work" , "Trivial matter" , "Something trivial" , "trifling amount" .)

I've seen this clue in the Evening Standard.
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