He has a hunch as if weird doom is to follow (9)
I believe the answer is:
quasimodo
'he has a hunch' is the definition.
The definition suggests a singular noun which matches the answer.
'as if weird doom is to follow' is the wordplay.
'as if' becomes 'quasi' (I've seen this in another clue).
'weird' indicates anagramming the letters.
'is to follow' says to put letters next to each other.
'doom' is an anagram of 'modo'.
'quasi'+'modo'='QUASIMODO'
Can you help me to learn more?
(Other definitions for quasimodo that I've seen before include "cathedral bellringer puts in an appearance" , "Low Sunday" , "Notre Dame hunchback" , "Victor Hugo character" , "bell ringer" .)