Clumsily sew the jagged tear in the garment (7)
I believe the answer is:
sweater
'the garment' is the definition.
(sweater is a kind of garment)
'clumsily sew the jagged tear' is the wordplay.
I cannot really see how this works, but
an anagram of 'sew' is 'swe' which is present in the answer.
an anagram of 'tear' is 'ater' which is present in the answer.
No letters remain.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for sweater that I've seen before include "Knitted upper garment" , "Clobber" , "One visibly too hot" , "Top" , "A present from Mum!" .)