Tenant is upset about losing money initially — monthly payment, say? (10)
I believe the answer is:
instalment
'monthly payment say?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'tenant is upset about losing money initially' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'initially' says to take the initial letters.
The initial letters of 'losing money' is 'lm'.
'tenant'+'is'='tenantis'
'tenantis' with letters rearranged gives 'instaent'.
'instaent' going around 'lm' is 'INSTALMENT'.
Can you help me to learn more?
(Other definitions for instalment that I've seen before include "Payment of part of debt" , "episode" , "Chapter" , "part of serial" , "One of a series of partial payments" .)