Crossword Genius

Wife has the plan to sharpen (4)

Ross

I believe the answer is:

whet

'sharpen' is the definition.
(whetting is a kind of sharpening)

'wife has the plan' is the wordplay.
'wife' becomes 'w'.
'has' is a charade indicator (letters next to each other).
'plan' indicates anagramming the letters (plan can mean organise).
'the' anagrammed gives 'het'.
'w'+'het'='WHET'

'to' is the link.

(Other definitions for whet that I've seen before include "grind" , "Sharpen by grinding" , "Sharpen - stimulate" , "Sharpen, appetite or razor" , "'Sharpen, appetite say (4)'" .)

I've seen this clue in The Mirror.
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