Get shot of initially agreeable relative (4)
I believe the answer is:
papa
'relative' is the definition.
(papa is a kind of relative)
'get shot of initially agreeable' is the wordplay.
'get' says to put letters next to each other.
'shot' becomes 'pap' (I can't justify this - if you can you should give a lot more credence to this answer).
'of initially' suggests taking the first letters (I've seen 'initially' mean this).
The first letter of 'agreeable' is 'a'.
'pap' put next to 'a' is 'PAPA'.
Can you help me to learn more?
(Other definitions for papa that I've seen before include "Dad" , "Mama's other half?" , "Father; letter P" , "Daddy]" , "The old man" .)