Decorative work is chore to perform in court (7)
I believe the answer is:
crochet
'decorative work' is the definition.
(crochet is a decorative craft)
'chore to perform in court' is the wordplay.
'to perform' indicates anagramming the letters (I've seen 'performed' mean this).
'in' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'chore' anagrammed gives 'roche'.
'roche' going inside 'ct' is 'CROCHET'.
'is' acts as a link.
(Other definitions for crochet that I've seen before include "Use a hooked needle to make garments" , "Decorative needlework using hooks" , "Craft product" , "Make fabric with a hook" , "In music, a note equal to half a minim" .)