Anger from one clergyman given unopened summons (10)
I believe the answer is:
irritation
'anger' is the definition.
(irritation is a kind of anger)
'one clergyman given unopened summons' is the wordplay.
'one' becomes 'i' (Roman numeral).
'clergyman' becomes 'ration' (I can't justify this - if you can you should give a lot more credence to this answer).
'given' means one lot of letters goes inside another.
'unopened' means to remove the first letter.
'summons' becomes 'writ' (I've seen this before).
'writ' with its first letter taken off is 'rit'.
'ration' enclosing 'rit' is 'rritation'.
'i'+'rritation'='IRRITATION'
'from' is the link.
Can you help me to learn more?
(Other definitions for irritation that I've seen before include "nuisance" , "Annoyance, anger" .)