Popular plant has circle in hell? (7)
I believe the answer is:
inferno
'hell?' is the definition.
('inferno' can be a synonym of 'hell')
'popular plant has circle' is the wordplay.
'popular' becomes 'in'.
'plant' becomes 'fern' (fern is a kind of plant**).
'has' is a charade indicator (letters next to each other).
'circle' becomes 'o'.
'in'+'fern'+'o'='INFERNO'
'in' is the link.
(Other definitions for inferno that I've seen before include "Hell - conflagration" , "A raging fire as in hell - ask Dante" , "hot spot" , "Large dangerous fire" , "Huge fire" .)