Idiot's point inspiring intellectual, finally (4)
I believe the answer is:
dolt
'idiot's' is the definition.
(I've seen this in another clue)
'point inspiring intellectual finally' is the wordplay.
'point' becomes 'dot' (synonyms).
'inspiring' is an insertion indicator.
'finally' indicates one should take the final letters.
The final letter of 'intellectual' is 'l'.
'dot' placed around 'l' is 'DOLT'.
(Other definitions for dolt that I've seen before include "Halfwit" , "Dull or stupid fellow" , "Dullard" , "Simpleton" , "Stupid person" .)