Display huge regret being a disparaged green activist (4-6)

I believe the answer is:

tree-hugger

I'm a little stuck... Click here to teach me more about this clue!

'a disparaged green activist' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'display huge regret' is the wordplay.
'display' indicates an anagram (I've seen 'displayed' mean this (letters displayed in another way)).
'huge'+'regret'='hugeregret'
'hugeregret' is an anagram of 'TREE-HUGGER'.

'being' acts as a link.

Can you help me to learn more?

(Other definitions for tree-hugger that I've seen before include "Active eco-warrior (informal)" , "One embracing trunks" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.