Crossword Genius

Monte Cristo always lacked some colonnaded covered walk (4)

Ross

I believe the answer is:

stoa

I'm a little stuck... Click here to teach me more about this clue!

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

'monte cristo always lacked some colonnaded' is the wordplay.
'STOA' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for stoa that I've seen before include "Series of columns covered" , "Make a Greek porch out of oats" , "Philosophers' porch" , "Where Zeno spoke" , "See Greek walk" .)

I've seen this clue in the Sydney Morning Herald.
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