Take it – it could be supreme (7)
I believe the answer is:
presume
'take it' is the definition.
(I've seen this before)
'it could be supreme' is the wordplay.
'it could be' indicates anagramming the letters (the same letters could be an anagram).
'supreme' anagrammed gives 'PRESUME'.
(Other definitions for presume that I've seen before include "Believe" , "Suppose without proof" , "Suppose; take liberties" , "Take to be the case" , "Surmise" .)