Yearned for a golden opportunity (6)

I believe the answer is:

longed

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

'yearned' is the definition.
('long' can be a synonym of 'yearn')

'a golden opportunity' is the wordplay.
'golden' anagrams to 'LONGED'.
But, I am unsure how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for longed that I've seen before include "Had a yen" , "Desire strongly" , "Thrust forward as with sword" , "Desired strongly" , "Pined" .)

I've seen this clue in the Evening Standard.

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