Flounder from beach with con­tents of bucket close to water (10)

'flounder' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'beach with contents of bucket close to water' is the wordplay.
'beach' becomes 'sands' (I've seen this before**).
'with' is a charade indicator (letters next to each other).
'contents of' says to take the centre (I've seen 'content of' mean this).
'close to' says to take the final letters (the close/ending of).
The middle of 'bucket' is 'ucke'.
The last letter of 'water' is 'r'.
'sands'+'ucke'+'r'='SAND-SUCKER'

'from' is the link.