Those joining together to oust Welsh leaders (6)
I believe the answer is:
elders
'leaders' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for elders that I've seen before include "Better and wiser people?" , "Church officers and small trees" , "plants?" , "Senior trees?" , "Senior members of tribe" .)