Stoop to a decorative knot (3)
I believe the answer is:
bow
This clue might be a double definition.
'stoop' is the first definition.
(I know that stoop can be written as bow)
'decorative knot' is the second definition.
'bow' can be an answer for 'knot' (bow is a kind of knot). I'm not sure about the 'decorative' bit.
'to a' is the link.
Can you help me to learn more?
(Other definitions for bow that I've seen before include "Loose knot" , "The archer's weapon." , "Bend from the waist in deference" , "Piece of weaponry" , "Acknowledge applause as actor does" .)