Underlined upside-down puddings (8)
I believe the answer is:
desserts
'puddings' is the definition.
(I've seen this before)
'underlined upside-down' is the wordplay.
'underlined' becomes 'stressed' (I've seen this in another clue).
'upside down' says the letters should be written in reverse.
'stressed' reversed gives 'DESSERTS'.
(Other definitions for desserts that I've seen before include "Sweets" , "Sweet courses of meal" , "That may be cobblers" , "Puddings" , "Last courses" .)