Physical training outside university feasible for don (3,2)
I believe the answer is:
put on
'don' is the definition.
('put on' can be a synonym of 'don')
'physical training outside university feasible' is the wordplay.
'physical training' becomes 'pt'.
'outside' is an insertion indicator.
'university' becomes 'u'.
'feasible' becomes 'on'.
'pt' placed around 'u' is 'put'.
'put'+'on'='PUT-ON'
'for' acts as a link.
(Other definitions for put on that I've seen before include "Affixed" , "Don clothes or stage play" , "Don; mount (a play)" , "in an unnatural way" , "Assume < present" .)