Loud preacher has nearly half of Harvard university consumed by rage (9)
I believe the answer is:
haranguer
'loud preacher' is the definition.
The definition suggests a singular noun which matches the answer.
'nearly half of harvard university consumed by rage' is the wordplay.
'nearly half of harvard' becomes 'har' (I can't justify this - if you can you should believe this answer much more).
'university' becomes 'u' (abbreviation for university).
'consumed by' means one lot of letters goes inside another (inserted letters get consumed).
'rage' becomes 'anger' (I've seen this in another clue).
'u' inserted into 'anger' is 'anguer'.
'har'+'anguer'='HARANGUER'
'has' acts as a link.
Can you help me to learn more?
(Another definition for haranguer that I've seen is " ranter".)