Crossword Genius

Files a letter as an afterthought (5)

Ross

I believe the answer is:

rasps

'files' is the definition.
(I know this)

'a letter as an afterthought' is the wordplay.
'a letter' becomes 'r' ().
'an afterthought' becomes 'ps' (as in a PS in a letter).
'r'+'as'+'ps'='RASPS'

(Other definitions for rasps that I've seen before include "Jars" , "fruit briefly" , "Scrapes" , "speaks hoarsely" , "Coarse files" .)

I've seen this clue in The Globe and Mail and The Irish News.
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