Lake, in Le Mans (3)
I believe the answer is:
lac
'lake in le mans' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lac that I've seen before include "Resinous substance an insect secretes" , "Resinous material" , "thousands from India" , "Huge sum" , "Stated need" .)