Meal measures up perfectly? To some extent (6)
I believe the answer is:
supper
'meal' is the definition.
(I know that Supper is a type of meal)
'measures up perfectly? to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'SUPPER' is hidden in the letters of 'measures up perfectly'.
(Other definitions for supper that I've seen before include "Light evening meal" , "singing for this?" , "consumer" , "Early evening meal" , "Late repast" .)