Network supplies room in empty lodge (7)
I believe the answer is:
lattice
'network' is the definition.
(I've seen this before)
'room in empty lodge' is the wordplay.
'room' becomes 'attic' (type of room).
'in' indicates putting letters inside.
'empty' suggests removing the centre.
'lodge' with its middle taken out is 'le'.
'attic' inserted within 'le' is 'LATTICE'.
'supplies' acts as a link.
(Other definitions for lattice that I've seen before include "Framework of crossed laths or bars" , "Network of Wooden strips" , "Framework for window" , "Grid" , "Sort of window" .)