Ace paper sent out to be published (6)
I believe the answer is:
appear
'be published' is the definition.
(I've seen this in another clue)
'ace paper sent out' is the wordplay.
'ace' becomes 'a' (abbreviation).
'sent' indicates an anagram (send can mean to excite or stimulate).
'out' means one lot of letters goes inside another.
'paper' with letters rearranged gives 'apper'.
'a' put into 'apper' is 'APPEAR'.
'to' is the link.
(Other definitions for appear that I've seen before include "Show up like ghost" , "hove in sight" , "Surface" , "Show up, become visible" , "Present oneself" .)