A tough time struggling to reload? (6)
I believe the answer is:
ordeal
'a tough time' is the definition.
(I've seen this in another clue)
'struggling to reload?' is the wordplay.
'struggling' indicates an anagram (the letters struggle or wriggle into a new form).
'reload' anagrammed gives 'ORDEAL'.
(Other definitions for ordeal that I've seen before include "Ancient form of trial" , "very hard test" , "Difficult and testing experience" , "Horrific experience" , "Disturbing experience" .)