Hall mate? (5)
I believe the answer is:
oates
'hall mate?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oates that I've seen before include "Member of Scott's expedition - "Popish Plot" conspirator" , "Antarctic explorer" , "sacrifice" , "Tragic captain" , "Popish Plot perjurer" .)