Remains with mineral deposit on dry land (6)
I believe the answer is:
ashore
'on dry land' is the definition.
(I've seen this before)
'remains with mineral deposit' is the wordplay.
'remains' becomes 'ash' (I've seen this before).
'with' means one lot of letters go next to another.
'mineral deposit' becomes 'ore' (I've seen this before).
'ash'+'ore'='ASHORE'
(Other definitions for ashore that I've seen before include "On(to) dry land" , "Toward land from water" , "Home for the sailor" , "on the coast" , "in port?" .)