Stick with joiner? (4)
I believe the answer is:
wand
'stick' is the definition.
(thesaurus)
'with joiner?' is the wordplay.
'with' becomes 'w' (abbreviation).
'joiner?' becomes 'and' (I've seen this in other clues).
'w'+'and'='WAND'
(Other definitions for wand that I've seen before include "Sorceror's magic stick" , "Magician's stick" , "Conjuror's stick" , "spelling aid" , "Magical staff" .)