Worry about nothing ourselves; just have a good time (7)
I believe the answer is:
carouse
'time' is the definition.
(thesaurus)
'worry about nothing ourselves' is the wordplay.
'worry' becomes 'care' (eg without a care means without a worry).
'about' is an insertion indicator.
'nothing' becomes 'O' (looks like zero - 0).
'ourselves' becomes 'us'.
'o'+'us'='ous'
'care' enclosing 'ous' is 'CAROUSE'.
'just have a good' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for carouse that I've seen before include "Roister" , "Party noisily" , "Celebrate noisily" , "booze" , "Drink freely and noisily" .)