Pick up once it's sorted (6)
I believe the answer is:
notice
'pick up' is the definition.
(thesaurus)
'once it's sorted' is the wordplay.
'sorted' is an anagram indicator.
'once'+'it'='onceit'
'onceit' anagrammed gives 'NOTICE'.
(Other definitions for notice that I've seen before include "Advance indication of intention to resign" , "Notification" , "Observe or regard" , "See; advert" , "Sign posted in a public place" .)