Crossword Genius

Do end flu upset that's developed (8)

Ross

I believe the answer is:

unfolded

'developed' is the definition.
(unfolding is a kind of developing)

'do end flu upset' is the wordplay.
'upset' indicates an anagram.
'do'+'end'+'flu'='doendflu'
'doendflu' is an anagram of 'UNFOLDED'.

'that's' is the link.

(Other definitions for unfolded that I've seen before include "developed" , "Revealed; spread out" .)

I've seen this clue in The Telegraph.
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