Crossword Genius

Sharpens head of tool being blunt (6)

Ross

I believe the answer is:

honest

'being blunt' is the definition.
(blunt can mean honest or frank)

'sharpens head of tool' is the wordplay.
'sharpens' becomes 'hones' (honing is a kind of sharpening).
'head of' suggests taking the first letters.
The initial letter of 'tool' is 't'.
'hones'+'t'='HONEST'

(Other definitions for honest that I've seen before include "Without dissimulation or guile" , "Upright and straightforward" , "Honorable and sincere" , "Genuine and trustworthy" , "Genuine; fair" .)

I've seen this clue in The Telegraph.
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