Crossword Genius

Mother has an afterthought - a complaint (5)

Ross

I believe the answer is:

mumps

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

'mother has an afterthought' is the wordplay.
'mother' becomes 'mum' (mum is a kind of mother**).
'has' is a charade indicator (letters next to each other).
'an afterthought' becomes 'ps' (ps stands for postscript).
'mum'+'ps'='MUMPS'

(Other definitions for mumps that I've seen before include "Infectious glandular disease" , "Complaint" , "Infectious disease, making neck glands swell" , "Viral disease with swellings" , "Viral disease, dangerous to adult males" .)

I've seen this clue in the Evening Standard.
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