Christopher to give up ringing his first relatives (4,3,3)
I believe the answer is:
kith and kin
'relatives' is the definition.
(thesaurus)
'christopher to give up ringing his first' is the wordplay.
'christopher' becomes 'Kit' (short for Christopher).
'to give up' becomes 'handin' (to hand something in is to surrender it).
'ringing' indicates putting letters inside.
'his first' becomes 'k' (I can't explain this - if you can you should give a lot more credence to this answer).
'handin' placed around 'k' is 'handkin'.
'kit'+'handkin'='KITH AND KIN'
(Another definition for kith and kin that I've seen is " Friends and relations".)