Crossword Genius

Knife fight about it upset learner driver (8)

Ross

I believe the answer is:

stiletto

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'knife' is the definition.
(stiletto is a kind of knife)

'fight about it upset learner driver' is the wordplay.
'fight' becomes 'set-to' (set-to can mean a fight or argument).
'about it' means one lot of letters goes inside another (some letters go around or about others).
'upset learner driver' becomes 'til' (I can't explain this - if you can you should believe this answer much more).
'setto' placed around 'til' is 'STILETTO'.

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(Other definitions for stiletto that I've seen before include "Small dagger and high narrow heel" , "Dagger with narrow blade, or a high heel" , "Narrow-bladed dagger" , "Kind of heel" , "Bedspread" .)

I've seen this clue in The Telegraph.
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