Such an opportunity one may have longed for (6)

I believe the answer is:

golden

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

'such' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'an opportunity one may have longed for' is the wordplay.
'longed' anagrams to 'GOLDEN'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for golden that I've seen before include "- - handshake" , "50th Jubilee" , "Excellent" , "In Woodstock we are this" , "Halcyon - yellow" .)

I've seen this clue in the Evening Standard.

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.