It's charitable of Max, maybe (5)
I believe the answer is:
oxfam
'it's charitable' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'of max maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'of'+'max'='ofmax'
'ofmax' anagrammed gives 'OXFAM'.
Can you help me to learn more?
(Other definitions for oxfam that I've seen before include "relief agency" , "A famine-relief charity" , "Famine relief charity" , "Famine relief organisation" , "Disaster-relief charity" .)