Order out of the garret! (6)
I believe the answer is:
garter
'order' is the definition.
(thesaurus)
'of the garret' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'garret' with letters rearranged gives 'GARTER'.
'out' is the link.
(Other definitions for garter that I've seen before include "Sock supporter" , "It holds a stocking up" , "Band to keep a stocking or sleeve up" , "Support for a stocking" , "Band worn on leg" .)