Renegade clings to a longing for the past (9)

I believe the answer is:

nostalgic

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

'longing for the past' is the definition.
(I've seen this before)

'renegade clings to a' is the wordplay.
'clings to a' can be anagrammed to 'NOSTALGIC'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for nostalgic that I've seen before include "Home sick" , "Wistful" , "Desirous of past times" , "recollection?" , "Yearning for the past" .)

I've seen this clue in The Times.

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