Crossword Genius

Aunt set about making complaint (7)

Ross

I believe the answer is:

tetanus

'complaint' is the definition.
(tetanus is a kind of health problem)

'aunt set about' is the wordplay.
'about' indicates an anagram.
'aunt'+'set'='auntset'
'auntset' is an anagram of 'TETANUS'.

'making' is the link.

(Other definitions for tetanus that I've seen before include "Disease causing muscular spasms" , "Bacterial disease" , "Infection of the central nervous system" , "Attunes (anag) - muscular illness" , "Attunes to disease from dog-bite" .)

I've seen this clue in The Telegraph.
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