Sources of wood used around part of window frame recalled garden items (9)
I believe the answer is:
trellises
'garden items' is the definition.
(a trellis is a mesh structure used in gardening)
'sources of wood used around part of window frame recalled' is the wordplay.
'sources of wood' becomes 'trees' (wood comes from trees).
'used around' is an insertion indicator.
'part of window frame' becomes 'sill' (a window sill).
'recalled' says the letters should be written backwards.
'sill' backwards is 'llis'.
'trees' going around 'llis' is 'TRELLISES'.
(Other definitions for trellises that I've seen before include "latticed structures" , "Plant supports" .)