Unlimited foresight, terribly monstrous (7)
I believe the answer is:
ogreish
'monstrous' is the definition.
(I've seen this before)
'unlimited foresight terribly' is the wordplay.
'unlimited' says to take the centre (discard the edges or 'limits' of the word).
'terribly' indicates an anagram.
The centre of 'foresight' is 'oresigh'.
'oresigh' with letters rearranged gives 'OGREISH'.
(Other definitions for ogreish that I've seen before include "Terrifyingly big" , "Cruel and terrifying" , "Ugly" , "Looking like a fiend" , "Like a cruel monster" .)