Crossword Genius

Plunge has sea bird catching a fly, say (8)

Ross

I believe the answer is:

dipteran

'fly say' is the definition.
(I know that fly is a type of dipteran)

'plunge has sea bird catching a' is the wordplay.
'plunge' becomes 'dip' (synonyms).
'has' says to put letters next to each other.
'sea bird' becomes 'tern' (tern is a kind of sea bird).
'catching' indicates putting letters inside.
'tern' enclosing 'a' is 'teran'.
'dip'+'teran'='DIPTERAN'

I've seen this clue in The Times.
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