Coastal features - salted nuts? (6)
I believe the answer is:
deltas
'coastal features' is the definition.
(I've seen this before)
'salted nuts?' is the wordplay.
'nuts?' indicates anagramming the letters (nuts can mean crazy).
'salted' with letters rearranged gives 'DELTAS'.
(Other definitions for deltas that I've seen before include "Coastal features" , "Triangular areas where rivers divide before entering the sea" , "Triangular islands at mouths of rivers" , "Triangular patches of land at mouths of rivers" , "some flowers form them" .)