There's no getting round it, I'm no longer trendy! (7)

I believe the answer is:

impasse

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'there's no getting round it' is the definition.
I can't judge whether this defines the answer.

'i'm no longer trendy' is the wordplay.
'no longer trendy' becomes 'passe' (I've seen this in another clue).
'im'+'passe'='IMPASSE'

Can you help me to learn more?

(Other definitions for impasse that I've seen before include "Stalling of negotiations" , "Inescapable perdicament, dilemma" , "nothing can be done" , "Situation in which no progress can be made" , "Unpromising situation" .)

I've seen this clue in The Independent.

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