Crossword Genius

Complaint made by topless Americans who deliver letters on time (7)

Ross

I believe the answer is:

ailment

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'complaint' is the definition.
(synonyms)

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(Other definitions for ailment that I've seen before include "Minor illness" , "Malady" , "Complaint, affliction" , "Physical disorder" , "I lament (anag.)" .)

I've seen this clue in The Times.
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