Meal to go bad when being eaten? (5)
I believe the answer is:
roast
'meal' is the definition.
(I've seen this before)
'go bad when being eaten' is the wordplay.
'go bad' becomes 'rot' (I've seen this in another clue).
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'being eaten' indicates putting letters inside.
'rot' placed around 'as' is 'ROAST'.
'to' is the link.
(Other definitions for roast that I've seen before include "Oven-cooked joint" , "Cook with dry heat" , "traditional meal" , "Traditional dinner" , "Traditional Sunday lunch" .)