Right to get overjoyed when told (7)
I believe the answer is:
related
'told' is the definition.
(relating is a kind of telling)
'right to get overjoyed' is the wordplay.
'right' becomes 'r' (common abbreviation).
'to get' means one lot of letters go next to another.
'overjoyed' becomes 'elated' (I've seen this before).
'r'+'elated'='RELATED'
'when' is the link.
(Other definitions for related that I've seen before include "similar" , "Treadle (anag) - akin" , "As siblings obviously are" , "Connected by blood or marriage" , "Kindred" .)