Second comic's loot (4)
I believe the answer is:
swag
'loot' is the definition.
(I've seen this before)
'second comic's' is the wordplay.
'second' becomes 's' (common abbreviation).
'comic' becomes 'wag'.
's'+'wag'='SWAG'
(Other definitions for swag that I've seen before include "pack of Aussie travellers" , "Ill-gotten gains" , "Part of a curtain" , "Loop of drapery" , "Burglar's spoils" .)