Lee Dixon originally turned up bearing sign of rustiness (4,5)
I believe the answer is:
iron oxide
'sign of rustiness' is the definition.
(rust is formed of iron oxide)
'lee dixon originally turned up bearing' is the wordplay.
'bearing' says the answer is hidden in the clue (the clue carries or bears the answer inside it).
'turned up' is a reversal indicator.
'edixonori' is hidden in the letters of 'lee dixon originally'.
'edixonori' written backwards gives 'IRON OXIDE'.
(Other definitions for iron oxide that I've seen before include "Eg, rust" , "I might appear on old bike" , "evidence of degradation?" , "Compound" .)