Giving (8)
'giving' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for generous that I've seen before include "Willing to give unstintingly" , "Magnanimous" , "More than adequate" , "Munificent; liberal" , "Princely" .)
'giving' is the definition.
(donating is a kind of giving)
This is the entire clue.
(Other definitions for donating that I've seen before include "Giving to charity" , "Giving away - maybe blood" , "I don't nag about giving" , "Offering a gift" .)