Around tree, indicate source of money (9)
I believe the answer is:
cashpoint
'source of money' is the definition.
'cashpoint' can be an answer for 'source' (I have seen 'source of funds' mean 'cashpoint' so perhaps 'source' could also mean 'cashpoint'). I'm not sure about the 'of money' bit.
'around tree indicate' is the wordplay.
'around' becomes 'c' (abbreviation for 'circa').
'tree' becomes 'ash' (ash is a kind of tree).
'indicate' becomes 'point' (synonyms).
'c'+'ash'+'point'='CASHPOINT'
Can you help me to learn more?
(Other definitions for cashpoint that I've seen before include "Money dispenser" , "source of funds" , "Hole in the wall" , "Automated teller machine" , "Where to get out money" .)