Crossword Genius

Celebration, nervy, as Iran is involved (11)

Ross

I believe the answer is:

anniversary

'celebration' is the definition.
(I've seen this before)

'nervy as iran is involved' is the wordplay.
'is involved' indicates anagramming the letters (involved can mean confusing or complex).
'nervy'+'as'+'iran'='nervyasiran'
'nervyasiran' anagrammed gives 'ANNIVERSARY'.

(Other definitions for anniversary that I've seen before include "Celebration" , "Eg, a birthday" , "Day marking a past event" , "Yearly commemoration" , "special occasion" .)

I've seen this clue in The Sunday Times and The Times.
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