Mark hurls after eating my turnover (6)
I believe the answer is:
symbol
'mark' is the definition.
(I've seen this before)
'hurls after eating my turnover' is the wordplay.
'hurls' becomes 'lobs'.
'after eating' means one lot of letters goes inside another.
'turnover' says the letters should be written backwards.
'lobs' going around 'my' is 'lobmys'.
'lobmys' in reverse letter order is 'SYMBOL'.
(Other definitions for symbol that I've seen before include "Representation, token" , "Emblem, icon" , "My lobs (anag)" , "Something that stands for or suggests another thing" , "Something representative" .)