Make a hole in your cardigan (3)
I believe the answer is:
dig
'make a hole' is the definition.
(I've seen this in another clue)
'in your cardigan' is the wordplay.
'in' indicates a hidden word.
'DIG' is hidden in the letters of 'your cardigan'.
(Other definitions for dig that I've seen before include "A brief archeological excavation" , "Excavate - enjoy" , "An informal archeological excavation" , "Understand" , "Loosen, or remove earth" .)