Senior relations to have called round (7)
I believe the answer is:
ranking
'senior' is the definition.
(similar in meaning)
'relations to have called round' is the wordplay.
I cannot quite understand how this works, but
'relations' could be 'kin' (I've seen this before) and 'kin' is found within the answer.
'called' could be 'rang' (called on the phone) and 'rang' is found within the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ranking that I've seen before include "Position in a hierarchy" , "position on graded scale" , "Assigning a position to" , "Status" , "Grading" .)