Doubter is disposed to be intrusive (7)
I believe the answer is:
obtrude
'be intrusive' is the definition.
I can't tell whether this defines the answer.
'doubter is disposed' is the wordplay.
'is disposed' indicates an anagram.
'doubter' with letters rearranged gives 'OBTRUDE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for obtrude that I've seen before include "Make unpleasantly noticeable" , "Stick out unpleasantly" , "Impose or force (something) on someone" , "Doubter (anag)" , "Stick out awkwardly" .)