It can be a slab of wood (5)

I believe the answer is:

balsa

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

'it can be a slab' is the wordplay.
'a slab' anagrams to 'BALSA'.
But, I am not sure how the anagram is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for balsa that I've seen before include "South American tree" , "Wood used in model making" , "A slab (anag.)" , "Very light timber" , "Raft-making S American corkwood" .)

I've seen this clue in the Evening Standard.

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