Develop physique (5)
I believe the answer is:
build
This clue is a double definition.
'develop' is the first definition.
(building is a kind of developing)
'physique' is the second definition.
('build' can be a synonym of 'physique')
(Other definitions for build that I've seen before include "Institute" , "Construct" , "Put up" , "Create" , "Increase gradually" .)