Doctor reloads tests (7)
I believe the answer is:
ordeals
'tests' is the definition.
(I have seen 'difficult tests' mean 'ordeals' so perhaps 'tests' could also mean 'ordeals')
'doctor reloads' is the wordplay.
'doctor' indicates an anagram.
'reloads' with letters rearranged gives 'ORDEALS'.
(Other definitions for ordeals that I've seen before include "Trying experiences" , "difficult tests" , "Testing experiences" , "Tribulations" , "Difficult experiences, hard times" .)