Greek cross about notice left in a V&A fish dish (9)

'fish dish' is the definition.
(Scandinavian fish dish)

'greek cross about notice left in a va' is the wordplay.
I cannot quite see how this works, but
'greek' could be 'gr' (abbreviation for Greek) and 'gr' is present in the answer.
'cross' could be 'x' (X is cross-shaped) and 'x' is present in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'notice' could be 'ad' (both can mean an advertisement) and 'ad' is present in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
'a' is present in the answer.
A single letter 'v' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).