Crossword Genius

One may be bent on filing them (8)

Ross

I believe the answer is:

toenails

I'm a little stuck... Click here to teach me more about this clue!

'filing them' is the definition.
I can't tell whether this definition defines the answer.

'one may be bent on' is the wordplay.
'may be' indicates an anagram.
'bent' becomes 'tails' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' is an insertion indicator (as in clothing \'on\' a person).
'one' anagrammed gives 'oen'.
'oen' inserted inside 'tails' is 'TOENAILS'.

Can you help me to learn more?

(Other definitions for toenails that I've seen before include "Extremities" , "types of digital hardware" .)

I've seen this clue in the Evening Standard.
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