Crossword Genius

Cook right on the oven (5)

Ross

I believe the answer is:

roast

'cook' is the definition.
(I know that roast is a more specific form of cook)

'right on the oven' is the wordplay.
'right' becomes 'r' (common abbreviation).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the oven' becomes 'oast' (type of kiln).
'r'+'oast'='ROAST'

(Other definitions for roast that I've seen before include "Reprimand severely" , "Feel hot" , "Sunday tradition" , "Heat strongly - criticise excessively" , "Honey-based drink" .)

I've seen this clue in The Globe and Mail.
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