A very original couple (4,3,3)
I believe the answer is:
adam and eve
'couple' is the definition.
(I have seen 'Legendary couple' mean 'adam and eve' so perhaps 'couple' could also mean 'adam and eve')
'a very original' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
'very' could be 'v' (abbreviation) and 'v' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adam and eve that I've seen before include "First people" , "First couple on earth" , "gardeners" , "early marriage?" , "First two characters" .)