Meeting places of old men having a chat outside (6)
I believe the answer is:
agoras
'meeting places of old' is the definition.
(I've seen this in another clue)
'men having a chat outside' is the wordplay.
I cannot quite understand how this works, but
'men' could be 'or' (military abbreviation for Other Ranks) and 'or' is found within the answer.
'a' is within the answer.
'chat' could be 'gas' (informal term meaning to chat) and 'gas' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for agoras that I've seen before include "Hellenic gatherings" , "Greek marketplaces" .)