Supporting frame (7)
I believe the answer is:
trestle
'supporting frame' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for trestle that I've seen before include "Braced support" , "Supporting structure for bridge or tabletop" , "Wooden frame" , "Supporting framework for, eg, table top" , "Letters (anag) - table" .)