Smooth man that may be found on beach (10)
I believe the answer is:
sandcastle
'that may be found on beach' is the definition.
(sandcastles might be built on a beach)
'smooth man' is the wordplay.
'smooth' becomes 'sand' (sanding is a kind of smoothing).
'man' becomes 'castle' ('man' can mean a chess piece).
'sand'+'castle'='SANDCASTLE'
(Other definitions for sandcastle that I've seen before include "one that goes with the flow?" , "Model on a beach" , "Fortress constructed on the beach" .)