£1,000,050,500 unlimited menu for anniversary (6)

I believe the answer is:

golden

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

'anniversary' is the definition.
(as in a golden anniversary)

'ps1000050500 unlimited menu' is the wordplay.
'psg000050500' becomes 'gold' (I am not sure about this - if you are sure you should believe this answer much more).
'unlimited' indicates the central letters (discard the edges or 'limits' of the word).
The middle letters of 'menu' are 'en'.
'gold'+'en'='GOLDEN'

'for' is the link.

Can you help me to learn more?

(Other definitions for golden that I've seen before include "Colour of the fleece sought by Jason" , "- - wedding (50th)" , "50th Jubilee" , "With sixteen across Apple variety" , "Gilded, pale yellow" .)

I've seen this clue in The Guardian.

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