Corrodes truss badly (5)
I believe the answer is:
rusts
'corrodes' is the definition.
('rust' can be a synonym of 'corrode')
'truss badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'truss' with letters rearranged gives 'RUSTS'.
(Other definitions for rusts that I've seen before include "How iron corrodes" , "Oxidises" .)
I've seen this clue in The Mirror.
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