Shopper needs carrier taking drink outside (8)

I believe the answer is:

betrayer

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'shopper' is the definition.
(I've seen this before)

'carrier taking drink outside' is the wordplay.
'carrier' becomes 'tray' (I've seen this before).
'taking drink' becomes 'beer' (beer is a kind of drink. I am not sure about the 'taking' bit.).
'outside' means one lot of letters goes inside another (some letters go outside others).
'tray' inserted inside 'beer' is 'BETRAYER'.

'needs' acts as a link.

Can you help me to learn more?

(Other definitions for betrayer that I've seen before include "Eg Judas Iscariot" , "snake" , "grass" , "traitor" , "Shopper" .)

I've seen this clue in The Times.

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