Rotter to pass club porter? (6)

I believe the answer is:

caddie

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'club porter?' is the definition.
'caddie' can be an answer for 'porter?' (thesaurus). I'm not sure about the 'club' bit.

'rotter to pass' is the wordplay.
'rotter' becomes 'cad' (a cad is a dishonourable person).
'to pass' becomes 'die' (as in passing away).
'cad'+'die'='CADDIE'

Can you help me to learn more?

(Other definitions for caddie that I've seen before include "A golfer's assistant-adviser" , "Golf course assistant" , "Golfer's assistant on course" , "Golfer's aide" , "He's on course to help" .)

I've seen this clue in The Independent.

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