Uncontrolled teen lust is to cause restlessness (8)
I believe the answer is:
unsettle
'to cause restlessness' is the definition.
'uncontrolled teen lust' is the wordplay.
'uncontrolled' indicates an anagram.
'teen'+'lust'='teenlust'
'teenlust' anagrammed gives 'UNSETTLE'.
'is' is the link.
(Other definitions for unsettle that I've seen before include "Disrupt" , "Nettle us so as to disturb" , "Throw" , "Make uneasy, disturb the calm of" , "Discompose" .)