Dorothy's dog, all dressed up for a party, wanting to make the most of it (2,2,4)
I believe the answer is:
go to town
'all dressed up for a party wanting to make the most of it' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'dorothy's dog' is the wordplay.
I cannot really see how this works, but
'dog' could be 'toto' (I've seen this before) and 'toto' is present in the answer.
The remaining letters 'gown' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for go to town that I've seen before include "Be most thorough" , "Stop at nothing" , "Behave without restraint" , "wanting to have a ball" , "Push boat out" .)