Crossword Genius

Host's possible answer to "Do you use hairspray to hold your hair back?" (6)

Ross

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" .)

I've seen this clue in The Independent.
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