Cat made of iron cable (6)
I believe the answer is:
feline
'cat' is the definition.
(I've seen this before)
'iron cable' is the wordplay.
'iron' becomes 'fe' (chemical symbol for iron).
'cable' becomes 'line' (synonyms).
'fe'+'line'='FELINE'
'made of' acts as a link.
(Other definitions for feline that I've seen before include "An animal of the cat family" , "Of or like cats" , "16 [TOM] perhaps" , "Like a leopard, say" , "(Relating to a) cat" .)