Slip in a record (8,5)
I believe the answer is:
clerical error
'a record' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'slip' is the wordplay.
I cannot quite understand how this works, but
'slip' could be 'error' (I've seen this before) and 'error' is found within the answer.
The remaining letters 'clerical' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for clerical error that I've seen before include "Mistake in the office?" , "Mistake in paperwork" .)