Agreed toe is deformed somewhat (2,1,6)
I believe the answer is:
to a degree
'somewhat' is the definition.
(I've seen this before)
'agreed toe is deformed' is the wordplay.
'is deformed' indicates anagramming the letters.
'agreed'+'toe'='agreedtoe'
'agreedtoe' is an anagram of 'TO A DEGREE'.
(Other definitions for to a degree that I've seen before include "Where university course may lead" , "Where undergraduate is heading" , "Where university study takes you" , "Up to a point" , "in some measure" .)