Child revealed by somewhat discontented informant (6)
I believe the answer is:
infant
'child' is the definition.
(I know that infant is a type of child)
'discontented informant' is the wordplay.
'discontented' says to hollow out the word (remove centre letters) (the word's contents are removed).
'informant' with its centre taken out is 'INFANT'.
'revealed by somewhat' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for infant that I've seen before include "Tot" , "Youngster" , "Thing in early stage; minor (legal)" , "Very small child" , "Tiny baby" .)