Remit (including honorary payment) allowance (7)
I believe the answer is:
stipend
'allowance' is the definition.
(I've seen this before)
'remit including honorary payment' is the wordplay.
'remit' becomes 'send' (I've seen this before).
'including' is an insertion indicator.
'honorary payment' becomes 'tip' (tip is a kind of payment. I am not sure about the 'honorary' bit.).
'send' enclosing 'tip' is 'STIPEND'.
Can you help me to learn more?
(Other definitions for stipend that I've seen before include "Regular salary" , "Periodical allowance" , "Regular money" , "Sum of money" , "Wage" .)