Quieten strangely prim little child (6)
I believe the answer is:
shrimp
'little child' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'quieten strangely prim' is the wordplay.
'quieten' becomes 'sh' (I can't justify this - if you can you should give a lot more credence to this answer).
'strangely' indicates anagramming the letters.
'prim' anagrammed gives 'rimp'.
'sh'+'rimp'='SHRIMP'
Can you help me to learn more?
(Other definitions for shrimp that I've seen before include "tiny fellow!" , "Raising of a siege" , "Diminutive person" , "Runt" , "who gets bullied?" .)