Section of coastline there, also heavenly (8)
I believe the answer is:
ethereal
'heavenly' is the definition.
('ethereal' can be similar in meaning to 'heavenly')
'section of coastline there also' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'ETHEREAL' can be found hidden inside 'coastline there also'.
(Other definitions for ethereal that I've seen before include "Like fairies" , "Airy or supernatural" , "Insubstantial or not of this world" , "Warm approval" , "Light, delicate, insubstantial" .)