A discontented Gideon, say, enclosing stall (8)
I believe the answer is:
stagnate
This clue might be a double definition.
'a discontented gideon say' is the first definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?
'enclosing stall' is the second definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?
Can you help me to learn more?
(Other definitions for stagnate that I've seen before include "Get stuck" , "Cease moving" , "Become still or stale through inactivity" , "decline" , "Fester" .)