Rent out one with a wild outlook (8)
I believe the answer is:
tearaway
'one with a wild outlook' is the definition.
(term for a wild or uncontrollable child)
'rent out' is the wordplay.
'rent' becomes 'tear' (synonyms).
'out' becomes 'away' (synonyms).
'tear'+'away'='TEARAWAY'
(Other definitions for tearaway that I've seen before include "Hothead" , "Delinquent" , "Rough" , "A tough" , "Yob" .)