Some cannibals are in wood (5)

I believe the answer is:

balsa

'wood' is the definition.
(type of wood)

'some cannibals are in' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BALSA' can be found hidden inside 'some cannibals are'.

(Other definitions for balsa that I've seen before include "Central American forest tree used to make floats, rafts, models etc" , "light raft" , "Raft-making S American corkwood" , "Tropical American tree" , "South American tree" .)

I've seen this clue in The Sun.

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