Time left for supporting cast to discover Arthurian site (8)

I believe the answer is:

tintagel

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'discover arthurian site' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'time left for supporting cast' is the wordplay.
'time' becomes 'age' (an age is a period of time).
'left' becomes 'l' (common abbreviation).
'for' says to put letters next to each other (I've seen this in other clues).
'supporting cast' becomes 'tint' (both can mean a colour or appearance. I am not sure about the 'supporting' bit.).
'age'+'l'='agel'
'agel' after 'tint' is 'TINTAGEL'.

'to' is the link.

Can you help me to learn more?

(Other definitions for tintagel that I've seen before include "King Arthur's birthplace" , "Castle in Cornwall" , "Bax tone poem, Cornish castle" , "Ruined Cornish castle" , "Town with Arthurian associations" .)

I've seen this clue in The Independent.

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