Conceal undercover agent that's been discovered twice (7)
I believe the answer is:
secrete
'conceal' is the definition.
(I know that secrete is a kind of conceal)
'undercover agent that's been discovered twice' is the wordplay.
I cannot really understand how this works, but
'undercover' could be 'secret' (synonyms) and 'secret' is located in the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for secrete that I've seen before include "Hide or conceal an object" , "squirrel" , "Cache" , "Release bodily fluid" , "Hide; as gland does" .)