Crossword Genius

Young slender person? Drink up! (4)

Ross

I believe the answer is:

slip

'young slender person?' is the definition.
(slip can mean a slender person)

'drink up' is the wordplay.
'drink' becomes 'pils' (type of beer).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'pils' written backwards gives 'SLIP'.

(Other definitions for slip that I've seen before include "Mistake -- small piece of paper" , "release > voucher" , "failure" , "shift" , "Mistake; garment" .)

I've seen this clue in The Guardian.
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