It may flutter by (9)

I believe the answer is:

butterfly

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'may flutter by' is the wordplay.
'may' indicates an anagram (I've seen 'might' mean this (I've seen this in other clues)).
'flutter'+'by'='flutterby'
'flutterby' is an anagram of 'BUTTERFLY'.

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(Other definitions for butterfly that I've seen before include "Beautiful insect and swimming stroke" , "Insect with four coloured wings and feelers" , "Lepidopterous insect" , "Insect with large, usually brightly coloured, wings" , "Peacock or red admiral, for example" .)

I've seen this clue in the Evening Standard.

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