Timber and seaweed on the beach (6)
I believe the answer is:
ashore
'on the beach' is the definition.
(I've seen this in another clue)
'timber and seaweed' is the wordplay.
'timber' becomes 'ash' (I've seen this before).
'and' means one lot of letters go next to another.
'seaweed' becomes 'ore' (I've seen this in other clues).
'ash'+'ore'='ASHORE'
(Other definitions for ashore that I've seen before include "Beached" , "Returned to land" , "Aground" , "on the coast" , "Off the boat" .)