Made of iron, this strange object of worship (6)
I believe the answer is:
'object of worship' is the definition.
'fetish' can be an answer for 'object' (I have seen 'Worshipped object ' mean 'fetish' so perhaps 'object' could also mean 'fetish'). I'm not certain of the 'of worship' bit.
'made of iron this strange' is the wordplay.
I cannot quite see how this works, but
'iron' could be 'fe' (Fe is the chemical symbol for iron) and 'fe' is found in the answer.
an anagram of 'this' is 'tish' which is within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for fetish that I've seen before include "magical object" , "thing?" , "Object of unreasoning devotion" , "Object worshipped for its supposed power" , "Obsession" .)