Rim (3)
'rim' is the definition.
(both can mean the edge of something)
This is all the clue.
(Other definitions for lip that I've seen before include "Top edge of a vessel" , "Edge of mouth" , "In slang, impudent talk" , "Fleshy fold of mouth tissue" , "Brim" .)
'rim' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for edge that I've seen before include "Boundary; advantage" , "Intense quality; limit" , "Verge" , "'Border, boundary, rim (4)'" , "Demarcation" .)