Philanthropic act associated with misplaced fine American coin (10)
I believe the answer is:
beneficent
'philanthropic' is the definition.
(I know that philanthropic can be written as beneficent)
'with misplaced fine american coin' is the wordplay.
'with' indicates putting letters inside.
'misplaced' is an anagram indicator (letters in the wrong places).
'american' becomes 'be' (I am not sure about this - if you are sure you should believe this answer much more).
'coin' becomes 'cent' (cent is a kind of coin).
'fine' is an anagram of 'nefi'.
'be'+'cent'='becent'
'nefi' put inside 'becent' is 'BENEFICENT'.
'act associated' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for beneficent that I've seen before include "Doing good" , "Generous" .)