Look round lake's shiny surface (5)
I believe the answer is:
glaze
'shiny surface' is the definition.
(I've seen this before)
'look round lake's' is the wordplay.
'look' becomes 'gaze' (gaze is a kind of look).
'round' means one lot of letters goes inside another.
'lake' becomes 'L' (geographical abbreviation).
'gaze' placed around 'l' is 'GLAZE'.
(Other definitions for glaze that I've seen before include "Gloss" , "Glossy surface" , "Put glass into" , "Pottery coating" , "Glassy surface" .)