Ostentatiously dressed as Marie Prevost was, according to rumour? (4,1,4,6)
I believe the answer is:
like a dogs dinner
'marie prevost was according to rumour?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'ostentatiously dressed as' is the wordplay.
I cannot quite see how this works, but
'as' could be 'like' (I've seen this in other clues) and 'like' is located in the answer.
The remaining letters 'adogsdinner' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for like a dogs dinner that I've seen is " So very smart".)