Sticky stuff, plate fairly edible? (7)
I believe the answer is:
goodish
'fairly edible?' is the definition.
(good can mean edible as opposed to rotten)
'sticky stuff plate' is the wordplay.
'sticky stuff' becomes 'goo' (I've seen this before).
'plate' becomes 'dish' (I've seen this before).
'goo'+'dish'='GOODISH'
(Other definitions for goodish that I've seen before include "reasonable" , "Quite acceptable" .)