Crossword Genius

Point to a colonnade (4)

Ross

I believe the answer is:

stoa

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

'colonnade' is the definition.
(architectural term)

'point to a' is the wordplay.
I cannot quite see how this works, but
'point' could be 's' (South) and 's' is present in the answer.
'to' is present in the answer.
'a' is found in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for stoa that I've seen before include "Greek portico or colonnade" , "Colonnade, covered walkway" , "Portico in ancient Greece" , "(In Ancient Greece) walkway with a roof supported by colonnades" , "Roofed walkway with colonnades - oats (anag)" .)

I've seen this clue in The Globe and Mail.
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