Host allows Roux make your starters (4)
I believe the answer is:
army
'host' is the definition.
(both can mean a large number of people)
'allows roux make your starters' is the wordplay.
'starters' says to take the initial letters (the letters which start the words).
The initial letters of 'allows roux make your' is 'ARMY'.
(Other definitions for army that I've seen before include "Multitude" , "See 21" , "Large military body" , "fighters" , "A great number (of soldiers?)" .)