Framework of metal bars (6)
I believe the answer is:
grille
'framework of metal bars' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for grille that I've seen before include "Frame of bars" , "Partition" , "Grating, metal screen" , "Metal lattice-work" , "Part of an air-cooling system" .)