Treat rest, taking sick, back in lattice (7)
I believe the answer is:
trellis
'lattice' is the definition.
(I've seen this before)
'treat rest taking sick back' is the wordplay.
'treat' indicates an anagram.
'taking' means one lot of letters goes inside another.
'sick' becomes 'ill' (similar in meaning).
'back' says the letters should be written in reverse.
'ill' in reverse letter order is 'lli'.
'rest' anagrammed gives 'tres'.
'tres' placed around 'lli' is 'TRELLIS'.
'in' is the link.
(Other definitions for trellis that I've seen before include "Frame for climbing plants" , "garden equipment" , "Latticed frame" , "Framework for creepers" , "Structure supporting climbing plants" .)