Lost again, rekindling homesickness (9)

I believe the answer is:

nostalgia

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

'homesickness' is the definition.
(I've seen this in another clue)

'lost again rekindling' is the wordplay.
'lost again' can be anagrammed to 'NOSTALGIA'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for nostalgia that I've seen before include "Fond remembrance" , "A longing for past times" , "Longing for things past" , "Sentimental feeling of analogist" , "severe homesickness" .)

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