One giving money includes right appeal (6)
I believe the answer is:
prayer
'appeal' is the definition.
(synonyms)
'one giving money includes right' is the wordplay.
'one giving' is a charade indicator (letters next to each other).
'money' becomes 'p'.
'includes' becomes 'raye' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'right' becomes 'r' (common abbreviation).
'p'+'raye' is 'praye'.
'praye'+'r'='PRAYER'
Can you help me to learn more?
(Other definitions for prayer that I've seen before include "Supplication [ital]" , "Supplication ot God" , "Earnest hope" , "Orison" , "An appeal to a deity" .)