Crossword Genius

Unravel red flag, possibly leading to complaint (9,5)

Ross

I believe the answer is:

glandular fever

'complaint' is the definition.
(glandular fever is a kind of disease)

'unravel red flag possibly' is the wordplay.
'possibly' indicates an anagram.
'unravel'+'red'+'flag'='unravelredflag'
'unravelredflag' anagrammed gives 'GLANDULAR FEVER'.

'leading to' is the link.

(Another definition for glandular fever that I've seen is " complaint".)

I've seen this clue in The Independent.
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