Armies of innkeepers? (5)
I believe the answer is:
hosts
This clue is a double definition.
'armies' is the first definition.
(host is a kind of army)
'innkeepers?' is the second definition.
('host' can be a synonym of 'innkeeper')
'of' is the link.
(Other definitions for hosts that I've seen before include "Great numbers of those who entertain?" , "those entertaining guests" , "Great numbers of party-givers" , "Innkeepers" , "Shots at entertainers" .)