Augments southern water supplies (6)
I believe the answer is:
swells
'supplies' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?
'augments southern water' is the wordplay.
I cannot really see how this works, but
'southern' could be 's' (abbreviation) and 's' is found within the answer.
'water' could be 'well' (well water is a kind of water) and 'well' is located in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for swells that I've seen before include "Grows larger like posh people" , "VIPs" , "Expands like posh people?" , "Informally posh people" , "Inflates like posh people" .)