Host's possible answer to "Do you use hairspray to hold your hair back?" (6)
I believe the answer is:
legion
'host's' is the definition.
('legion' can be a synonym of 'host')
I can't explain the rest of the clue.
(Other definitions for legion that I've seen before include "Military unit of ancient Rome" , "Body of Roman or French soldiers" , "Roman military formation" , "Division of ancient Roman army" , "Large body of soldiers" .)