Reminiscent of losing act unfortunately (9)

I believe the answer is:

nostalgic

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'reminiscent' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'losing act unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'losing'+'act'='losingact'
'losingact' is an anagram of 'NOSTALGIC'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for nostalgic that I've seen before include "Home sick" , "Longing for familiar things or persons" , "down Memory Lane" , "Sentimental about the past" , "Fondly remembering the past" .)

I've seen this clue in The Telegraph.

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