Member of family can let urge get out of control (5-5)
I believe the answer is:
great-uncle
'member of family' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'can let urge get out of control' is the wordplay.
'get out of control' indicates an anagram.
'can'+'let'+'urge'='canleturge'
'canleturge' anagrammed gives 'GREAT-UNCLE'.
Can you help me to learn more?
(Another definition for great-uncle that I've seen is " Relative".)