He gave the rondo new form (5)
I believe the answer is:
donor
'he gave' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'rondo new form' is the wordplay.
'new form' indicates anagramming the letters (I've seen 'new form of' mean this).
'rondo' with letters rearranged gives 'DONOR'.
'the' is the link.
Can you help me to learn more?
(Other definitions for donor that I've seen before include "Supporter" , "One contributing" , "Almsgiver, benefactor" , "A giver, often of blood" , "Giver, of blood say" .)