Detected to be inaccurate? (5,3)
I believe the answer is:
found out
'detected' is the definition.
(finding out is a kind of detecting)
'be inaccurate?' is the wordplay.
'be' becomes 'found' (I can't justify this - if you can you should give a lot more credence to this answer).
'inaccurate?' becomes 'out' (I've seen this before).
'found'+'out'='FOUND OUT'
'to' is the link.
Can you help me to learn more?
(Other definitions for found out that I've seen before include "Discovered" , "Ascertained" .)