Pleasant, similar to intelligent (8)
I believe the answer is:
likeable
'pleasant' is the definition.
(I've seen this in another clue)
'similar to intelligent' is the wordplay.
'similar to' becomes 'like' (I've seen this before).
'intelligent' becomes 'able'.
'like'+'able'='LIKEABLE'
(Other definitions for likeable that I've seen before include "Pleasant" , "Oxford college" , "Amiable" , "Winsome" , "Nice" .)