Square, where stone comes from? (3-2-4)

'square' is the definition.
(both can mean unfashionable)

'stone comes from?' is the wordplay.
I cannot quite see how this works, but
'from?' could be 'of' (I've seen this in other clues) and 'of' is found in the answer.
The remaining letters 'outdate' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

'where' is the link.