___ jar (5)
(Other definitions for tip that I've seen before include "The extreme end of insider information?" , "Indication of potential opportunity" , "single piece of asparagus, perhaps" , "given gratuitously" , "Dump; hint" .)
(Other definitions for mason that I've seen before include "One works with stone or brick" , "One is skilful with stone" , "A skilled worker in stone" , "Construction industry employee" , "Jewish comedian" .)