See group developed self-critical conscience (8)
I believe the answer is:
superego
'self-critical conscience' is the definition.
(part of the conscience according to Sigmund Freud)
'see group developed' is the wordplay.
'developed' indicates anagramming the letters.
'see'+'group'='seegroup'
'seegroup' is an anagram of 'SUPEREGO'.
(Other definitions for superego that I've seen before include "Freudian concept of conscience" , "Freud's part of the mind that acts as a self-critical conscience" , "self-critic" , "Internal monitor of psyche" , "Conscience, perhaps" .)