Wait on chief (6)
I believe the answer is:
remain
'wait' is the definition.
(thesaurus)
'on chief' is the wordplay.
'on' becomes 're' (regarding).
'chief' becomes 'main' (synonyms).
're'+'main'='REMAIN'
(Other definitions for remain that I've seen before include "Stay on after others have gone" , "Airmen (anag.)" , "stop behind?" , "Continue in position" , "Don't leave (the EU?)" .)