Former senator Lott (5)
I believe the answer is:
trent
'former senator lott' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trent that I've seen before include "Burton's river" , "Stoke's river" , "Eng. river; Council of -" , "River at Newark/Stoke" , "Major river of England" .)