Crossword Genius

Popular achievement for sure (6)

Ross

I believe the answer is:

indeed

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

'popular achievement' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'achievement' becomes 'deed' (deed is a kind of achievement).
'in'+'deed'='INDEED'

'for' acts as a link.

(Other definitions for indeed that I've seen before include "Really, without doubt" , "Truthfully, really" , "In fact, really" , "Certainty" , "Really - truly" .)

I've seen this clue in The Sun and The Independent.
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