Crossword Genius

Erroneously file a letter for a prisoner (5)

Ross

I believe the answer is:

lifer

'a prisoner' is the definition.
(lifer is a kind of prisoner)

'erroneously file a letter' is the wordplay.
'erroneously' indicates anagramming the letters.
'a letter' becomes 'r' ().
'file' anagrammed gives 'life'.
'life'+'r'='LIFER'

'for' acts as a link.

(Other definitions for lifer that I've seen before include "One given lots of porridge" , "Con" , "One behind bars for ever" , "One with very long sentence" , "Person serving long sentence" .)

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