Crossword Genius

Whole bunch in Kon-Tiki say (4)

Ross

I believe the answer is:

raft

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'whole bunch' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for raft that I've seen before include "vessel" , "Makeshift boat" , "Structure that floats" , "Simple floating structure" , "Floating platform of logs, planks, etc" .)

I've seen this clue in The Sun.
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