To me, a certain degree (7)
I believe the answer is:
measure
'degree' is the definition.
(thesaurus)
'to me a certain' is the wordplay.
'certain' becomes 'sure' ('sure' can be a synonym of 'certain').
'me'+'a'+'sure'='MEASURE'
(Other definitions for measure that I've seen before include "Act - dance" , "The size of a dance" , "Ascertain the length etc." , "Magnitude" , "Show something's dimensions" .)