It’s easy to file an account! (6)
I believe the answer is:
facile
'it's easy' is the definition.
('facile' can be a synonym of 'easy')
'file an account' is the wordplay.
I cannot really see how this works, but
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
'account' could be 'ac' and 'ac' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for facile that I've seen before include "A piece of cake" , "Over-simple, superficial" , "Lacking depth, argument say" , "Too easily achieved, glib" , "Superficial or too easily achieved" .)