Crossword Genius

Heart sickening knowledge? (3)

Ross

I believe the answer is:

ken

'knowledge?' is the definition.
(ken is a kind of knowledge)

'heart sickening' is the wordplay.
'heart' indicates a hidden word (I've seen 'heart of' mean this).
'KEN' is hidden in the letters of 'sickening'.

(Other definitions for ken that I've seen before include "Notice" , "Awareness" , "Understanding - boy's name" , "Know; man's name" , "One's range of knowledge" .)

I've seen this clue in the Evening Standard.
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