Framework still worked about interior (7)
I believe the answer is:
trellis
'framework' is the definition.
(I know that trellis is a type of fretwork)
'still worked about interior' is the wordplay.
'worked' is an anagram indicator.
'about' becomes 're' (regarding).
'interior' indicates putting letters inside.
'still' with letters rearranged gives 'tllis'.
'tllis' enclosing 're' is 'TRELLIS'.
(Other definitions for trellis that I've seen before include "Framework - stiller (anag)" , "Latticework support for plants" , "Frame for creepers" , "Latticework structure" , "trainer" .)