To reload incorrectly can be a trying experience (6)
I believe the answer is:
ordeal
'be a trying experience' is the definition.
(I've seen this before)
'to reload incorrectly' is the wordplay.
'incorrectly' indicates an anagram (I've seen this in other clues).
'reload' is an anagram of 'ORDEAL'.
'can' is the link.
(Other definitions for ordeal that I've seen before include "A difficult and harrowing experience" , "Loader (anag.)" , "Suffering - trial" , "Tough test in Laredo" , "One may be difficult" .)