Is your setter on leave in China? (5)
I believe the answer is:
amigo
'china?' is the definition.
(I've seen this before)
'is your setter on leave' is the wordplay.
'is your setter' becomes 'ami' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'leave' becomes 'go' (to go is to depart or leave).
'ami'+'go'='AMIGO'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for amigo that I've seen before include "Mexican's mate" , "in a foreign land, my friend?" , "friend abroad" , "Mexican friend" , "friend in Uruguay" .)