Design version of trap with net (7)
I believe the answer is:
pattern
'design' is the definition.
(I know that design can be written as pattern)
'version of trap with net' is the wordplay.
'version of' is an anagram indicator (another version of the same letters).
'with' is a charade indicator (letters next to each other).
'trap' put after 'net' is 'nettrap'.
'nettrap' with letters rearranged gives 'PATTERN'.
(Other definitions for pattern that I've seen before include "Shape or design" , "Ornamentation" , "Stencil" , "Arrangement of repeated parts of design" , "Design for copying" .)