It's topping, but unfashionable (3,3)
'unfashionable' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Another definition for oldhat that I've seen is " Out-of-date".)
'unfashionable' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for old hat that I've seen before include "Tediously familiar like ancient headgear" , "No longer fashionable or novel, like used headgear" , "Out of date like ancient headgear" , "Something outdated (colloq.)" , "Something out of date" .)