Dream I'm going round with a fabulous girl (7)
I believe the answer is:
mermaid
'a fabulous girl' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'dream i'm going round' is the wordplay.
'going round' is an anagram indicator.
'dream'+'im'='dreamim'
'dreamim' anagrammed gives 'MERMAID'.
'with' is the link.
Can you help me to learn more?
(Other definitions for mermaid that I've seen before include "Bird with a fish's tail" , "Fabulous woman" , "Mythical sea creature" , "Imaginary woman of the sea" , "Sea-girl!" .)