Crossword Genius

Seine isn't, if change escalates (11)

Ross

I believe the answer is:

intensifies

'escalates' is the definition.
('intensify' can be a synonym of 'escalate')

'seine isn't if change' is the wordplay.
'change' indicates anagramming the letters.
'seine'+'isnt'+'if'='seineisntif'
'seineisntif' with letters rearranged gives 'INTENSIFIES'.

I've seen this clue in The Daily Express.
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