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Posh MP in M&S makes complaint (5)

Ross

I believe the answer is:

mumps

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

'posh mp in ms' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'in' means one lot of letters goes inside another.
'u'+'mp'='ump'
'ump' going inside 'ms' is 'MUMPS'.

'makes' acts as a link.

(Other definitions for mumps that I've seen before include "Infectious disease, making neck glands swell" , "Viral disease mainly affecting children" , "Acute viral disease, often in children" , "Swollen-face disease" , "Disease once common in children" .)

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