Rope twisted together with highly stylised symbol (10)
I believe the answer is:
hieroglyph
'stylised symbol' is the definition.
'rope twisted together with highly' is the wordplay.
'twisted together with' indicates an anagram (the word must be twisted into a new form).
'rope' anagrammed with 'highly' makes 'HIEROGLYPH'.
(Other definitions for hieroglyph that I've seen before include "Egyptian written symbol" , "Stylised picture found in ancient Egyptian writings" , "Character in Egyptian writing" , "A character in symbolic writing" , "Theban character" .)