Otherwise, can be made of tin (2,3)
I believe the answer is:
if not
'otherwise' is the definition.
(synonyms)
'made of tin' is the wordplay.
'made' is an anagram indicator.
'of'+'tin'='oftin'
'oftin' anagrammed gives 'IF NOT'.
'can be' acts as a link.
(Other definitions for if not that I've seen before include "Failing that" , "Unless" .)
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