House made crates to support network (9)
I believe the answer is:
lancaster
'house' is the definition.
(I've seen this before)
'made crates to support network' is the wordplay.
'made' indicates anagramming the letters.
'to support' means one lot of letters go next to another (in a down clue, some letters hold others up).
'network' becomes 'lan' (LAN is an example).
'crates' is an anagram of 'caster'.
'caster' put after 'lan' is 'LANCASTER'.
(Other definitions for lancaster that I've seen before include "A rose-red city" , "old house" , "Say Crouchback" , "WW2 aircraft; city" , "Historical English royal house with the emblem of a red rose" .)