Come about a printer's setting (9)
I believe the answer is:
transpire
'come about' is the definition.
(thesaurus)
'a printer's setting' is the wordplay.
'setting' indicates an anagram.
'a'+'printers'='aprinters'
'aprinters' anagrammed gives 'TRANSPIRE'.
(Other definitions for transpire that I've seen before include "Become known about terrapins" , "Happen[s]" , "Come to pass" , "Ensue with terrapins" , "Terrapins (anag)" .)