Supports chain restaurants (10)
I believe the answer is:
brasseries
'restaurants' is the definition.
(brasserie is a kind of restaurant)
'supports chain' is the wordplay.
'supports' becomes 'bras' (I've seen this before).
'chain' becomes 'series' (I've seen this in another clue).
'bras'+'series'='BRASSERIES'
(Other definitions for brasseries that I've seen before include "Consumers make use of these" , "Restaurants" .)