Fancy case City men carried? (10)
I believe the answer is:
decorative
'fancy' is the definition.
(thesaurus)
'case city men carried?' is the wordplay.
'case' becomes 'dative' (the dative case in grammar).
'city men' becomes 'ecor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'carried?' means one lot of letters goes inside another (one word carried by another word).
'dative' placed around 'ecor' is 'DECORATIVE'.
(Other definitions for decorative that I've seen before include "fancy!" , "Ornamental" .)