Fix dossier's digital enhancer (8)

I believe the answer is:

nailfile

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'digital enhancer' is the definition.
The definition suggests a singular noun which matches the answer.

'fix dossier's' is the wordplay.
'fix' becomes 'nail' (I've seen this before).
'dossier' becomes 'file' (a dossier is a file or set of information).
'nail'+'file'='NAILFILE'

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(Other definitions for nailfile that I've seen before include "Manicurist's tool" , "Manicure item" .)

I've seen this clue in The Guardian.

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