Point to a portico (4)

I believe the answer is:

stoa

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'portico' is the definition.
(thesaurus)

'point to a' is the wordplay.
'point' becomes 'sto' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sto'+'a'='STOA'

Can you help me to learn more?

(Other definitions for stoa that I've seen before include "Architectural feature" , "Roofed walkway with colonnades - oats (anag)" , "Portico or roofed colonnade" , "Ancient Greek portico" , "classical colonnade" .)

I've seen this clue in The Telegraph.

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