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Fervent modern hippy alienating knight and wife (5)

Ross

I believe the answer is:

eager

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'fervent' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for eager that I've seen before include "Enthusiastic, avid" , "Excited by desire" , "Desperate" , "Longing to see" , "It's a bore" .)

I've seen this clue in The Telegraph.
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