Designer, last of many in list (9)
I believe the answer is:
inventory
'list' is the definition.
(I've seen this before)
'designer last of many' is the wordplay.
'designer' becomes 'inventor' (I've seen this before).
'last of' suggests the final letters.
The last letter of 'many' is 'y'.
'inventor'+'y'='INVENTORY'
'in' acts as a link.
(Other definitions for inventory that I've seen before include "assets" , "List of property, etc" , "List of items present" , "Detailed list of goods in stock" , "List of all items in stock" .)