Misheard bit referring to tropical tree (4)

I believe the answer is:

shea

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

'misheard bit referring to tropical' is the wordplay.
'SHEA' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for shea that I've seen before include "African tree with oily nuts" , "Butter from an African tree" .)

I've seen this clue in The Irish Times.

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