Moulded sink thrown away (3-4)
I believe the answer is:
die-cast
'moulded' is the definition.
(die-casting is a process of moulding metal)
'sink thrown away' is the wordplay.
'sink' becomes 'die' (languish).
'thrown away' becomes 'cast' (cast away).
'die'+'cast'='DIE-CAST'
(Another definition for die-cast that I've seen is " from The Matrix?".)
I've seen this clue in The Guardian.
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