A person who adores quarrel over sender of items abroad (10)
I believe the answer is:
worshipper
'a person who adores' is the definition.
(someone who adores or worships)
'quarrel over sender of items abroad' is the wordplay.
'quarrel' becomes 'row' (synonyms).
'over' is a reversal indicator.
'sender of items abroad' becomes 'shipper' (someone who ships things abroad).
'row' written backwards gives 'wor'.
'wor'+'shipper'='WORSHIPPER'
(Other definitions for worshipper that I've seen before include "Churchgoer" , "I believe" , "person in church?" , "One adoring a deity" , "Practiser of religion" .)