Stand in calm lake (5)
I believe the answer is:
easel
'stand' is the definition.
(easel is a kind of stand)
'calm lake' is the wordplay.
'calm' becomes 'ease' (I've seen this before).
'lake' becomes 'l'.
'ease'+'l'='EASEL'
'in' acts as a link.
(Other definitions for easel that I've seen before include "artist's requisite" , "Display tripod" , "Artist's stand for painting" , "Artistic support" , "Van Gogh's stand?" .)