Draw a wagon back in case of theft (7)
I believe the answer is:
attract
'draw' is the definition.
(attracting is a kind of drawing)
'a wagon back in case of theft' is the wordplay.
'wagon' becomes 'cart' (cart is a kind of wagon**).
'back' says the letters should be written backwards.
'in' is an insertion indicator.
'case of' means to remove the middle letters (outsides of).
'theft' with its centre removed is 'tt'.
'cart' reversed gives 'trac'.
'trac' inserted into 'tt' is 'ttract'.
'a'+'ttract'='ATTRACT'
(Other definitions for attract that I've seen before include "Exercise a magnetic influence" , "Draw towards like a magnet" , "Act as a magnet" , "Draw, pull" , "Behave like a magnet" .)