Area isn’t regenerated well? (8)
I believe the answer is:
artesian
'well?' is the definition.
(artesian well is a kind of well)
'area isn't regenerated' is the wordplay.
'regenerated' is an anagram indicator.
'area'+'isnt'='areaisnt'
'areaisnt' with letters rearranged gives 'ARTESIAN'.
(Other definitions for artesian that I've seen before include "Type of well made from a sea train" , "(Well) flowing under natural pressure" , "Type of deep well" , "This well is bored vertically into the ground" , "(Well) fed by pressure" .)