Sue left it over one entrance (8)

I believe the answer is:

litigate

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'sue' is the definition.
(I know that sue can be written as litigate)

'left it over one entrance' is the wordplay.
'left' becomes 'l' (common abbreviation).
'over one' becomes 'i' (Roman numeral. I am not sure about the 'over' bit.).
'entrance' becomes 'gate' (type of entrance).
'l'+'it'+'i'+'gate'='LITIGATE'

Can you help me to learn more?

(Other definitions for litigate that I've seen before include "Sue" , "Engage in legal proceedings" , "Contest at law" , "Dispute by law" , "take action" .)

I've seen this clue in The Sun.

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