A crush on youngster briefly socialising after a run? (5-3)

I believe the answer is:

apres-ski

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'a crush on youngster briefly socialising' is the definition.
I can't judge whether this definition defines the answer.

'after a run?' is the wordplay.
'after' becomes 'apres' (I've seen this in another clue).
'a run?' becomes 'ski' (I've seen this before).
'apres'+'ski'='APRES-SKI'

Can you help me to learn more?

(Other definitions for apres-ski that I've seen before include "holiday entertainment" , "Winter holiday fun" , "Amusements following winter sport" , "socialising in Davos?" , "Winter sports socialising" .)

I've seen this clue in The Guardian.

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