Deprived child - no harp ordered (6)
I believe the answer is:
orphan
'deprived child' is the definition.
'orphan' can be an answer for 'child' (orphan is a kind of child). I am not sure about the 'deprived' bit.
'no harp ordered' is the wordplay.
'ordered' is an anagram indicator.
'no'+'harp'='noharp'
'noharp' anagrammed gives 'ORPHAN'.
Can you help me to learn more?
(Other definitions for orphan that I've seen before include "Child who has lost both parents" , "One who has lost both parents" , "One bereft of parents" , "One deprived" , "Child without parent" .)