Leader to remain in touch to get commission (8)
I believe the answer is:
contract
'leader to remain' is the definition.
I can't tell whether this defines the answer.
'in touch to get commission' is the wordplay.
'in' is an insertion indicator.
'touch' becomes 'contact' (contact is a kind of touch).
'to get commission' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'contact' placed around 'r' is 'CONTRACT'.
Can you help me to learn more?
(Other definitions for contract that I've seen before include "Document setting out terms of agreement" , "Promise" , "Come down with" , "settlement" , "Pick up" .)