Jingoist makes Irishman go berserk (7)
I believe the answer is:
patriot
'jingoist' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'irishman go berserk' is the wordplay.
'irishman' becomes 'Pat' (Patrick is a common Irish name).
'go berserk' becomes 'riot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pat'+'riot'='PATRIOT'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for patriot that I've seen before include "Nationalist" , "One who loves his or her country" , "One defends his country" , "Country lover" , "A trip to (anag.)" .)