Injured marten on deck (8)
I believe the answer is:
ornament
'deck' is the definition.
(thesaurus)
'injured marten on' is the wordplay.
'injured' indicates an anagram.
'marten'+'on'='martenon'
'martenon' with letters rearranged gives 'ORNAMENT'.
(Other definitions for ornament that I've seen before include "It's used to adorn" , "accessory" , "Decorate" , "Trim" , "Embellish" .)