Moving van I left in smithy's block (5)
I believe the answer is:
anvil
'smithy's block' is the definition.
(I've seen this before)
'moving van i left' is the wordplay.
'moving' is an anagram indicator.
'left' becomes 'l' (common abbreviation**).
'van'+'i'='vani'
'vani' anagrammed gives 'anvi'.
'anvi'+'l'='ANVIL'
'in' acts as a link.
(Other definitions for anvil that I've seen before include "Smithy's block" , "hard block" , "Alvin (anag.)" , "Block on which metals are hammered" , "Smithy's last" .)