Comic publisher left, editor was amazed (9)
I believe the answer is:
marvelled
'was amazed' is the definition.
(I've seen this before)
'comic publisher left editor' is the wordplay.
'comic publisher' becomes 'marvel'.
'left' becomes 'l' (common abbreviation).
'editor' becomes 'ed'.
'marvel'+'l'+'ed'='MARVELLED'
(Other definitions for marvelled that I've seen before include "stood in awe" , "Was filled with wonder" , "was amazed" .)