Fervent modern hippy alienating knight and wife (5)
I believe the answer is:
eager
'fervent' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for eager that I've seen before include "Enthusiastic, avid" , "Excited by desire" , "Desperate" , "Longing to see" , "It's a bore" .)