Crossword Genius

With sick mind (4)

Ross

I believe the answer is:

will

'mind' is the definition.
(I've seen this before)

'with sick' is the wordplay.
'with' becomes 'w' (abbreviation).
'sick' becomes 'ill' (synonyms).
'w'+'ill'='WILL'

(Other definitions for will that I've seen before include "mind" , "Fixed intention" , "Shakespeare < 's intention to leave something" , "Resolve - testament" , "Volition" .)

I've seen this clue in The Sun.
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