Ringmaster from Halifax? (3)
I believe the answer is:
ali
'ringmaster' is the definition.
(I've seen this before)
'from halifax?' is the wordplay.
'from' says the answer is hidden in the clue.
'ALI' is hidden within 'halifax'.
(Other definitions for ali that I've seen before include "Lepidopterous floater, apian stinger, d. 2016" , "Person" , "US heavyweight boxer" , ""The Greatest" boxer" , "Champion of ring" .)