Stocky (8)
I believe the answer is:
thickset
'stocky' is the definition.
(I know that stocky can be written as thickset)
This is all the clue.
(Other definitions for thickset that I've seen before include "Solidly built; growing close together" , "Solidly built; stocky" , "sturdy" , "Strapping" , "Solidly-built" .)