Endless criticism I get in secret (6)
I believe the answer is:
mystic
'secret' is the definition.
(I know that secret can be written as mystic)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for mystic that I've seen before include "Sixth sense believer?" , "Of hidden or symbolic meaning as in religion" , "Allegorical; sacredly obscure" , "One seeking God through contemplation" , "Spiritualist" .)