Financial crash involving dome by Hants resort? (5,3,6)
I believe the answer is:
south sea bubble
'financial crash' is the definition.
(18th-century financial collapse)
'dome by hants resort?' is the wordplay.
'dome' becomes 'bubble' (I have seen 'Transparent dome' mean 'bubble' so perhaps 'dome' could also mean 'bubble').
'by' is a charade indicator (letters next to each other).
'hants resort?' becomes 'southsea' (resort in Hampshire, abbreviated Hants).
'bubble' put after 'southsea' is 'SOUTH SEA BUBBLE'.
'involving' is the link.
(Other definitions for south sea bubble that I've seen before include "18th century financial crash" , "Financial scandal" .)