Primate ready to receive king (6)
I believe the answer is:
monkey
'primate' is the definition.
(monkey is a kind of primate)
'ready to receive king' is the wordplay.
'ready' becomes 'money' (I've seen this before**).
'to receive' is an insertion indicator.
'king' becomes 'k'.
'money' enclosing 'k' is 'MONKEY'.
(Other definitions for monkey that I've seen before include "Long-tailed primate" , "Naughty child - 500 pounds" , "Medium-sized primate" , "Araucaria -- evergreen conifer" , "Small primate" .)