Sue flipped price tag -- it illustrates trousers (8)
I believe the answer is:
litigate
'sue' is the definition.
(I know that sue can be written as litigate)
'flipped price tag it illustrates trousers' is the wordplay.
'flipped' is a reversal indicator.
'trousers' says the answer is hidden in the clue (trouser can mean to steal or take).
'etagitil' is hidden in the letters of 'price tag it illustrates'.
'etagitil' written backwards gives 'LITIGATE'.
(Other definitions for litigate that I've seen before include "Sue" , "Dispute by law" , "Engage in legal proceedings" , "Contest at law" , "Go to law" .)