Funds wild teens going on vacation (4,3)
I believe the answer is:
nest egg
'funds' is the definition.
(thesaurus)
'wild teens going on vacation' is the wordplay.
'wild' indicates anagramming the letters.
'on vacation' means to remove the middle letters (after the inside letters have vacated the word).
'going' with its centre removed is 'gg'.
'teens' anagrammed gives 'neste'.
'neste'+'gg'='NEST-EGG'
(Other definitions for nest egg that I've seen before include "money put away" , "Retirement savings" , "Sum of money put by as a reserve" , "Savings for the future" , "Money laid aside for some future eventuality" .)