Tufted topper (3)
I believe the answer is:
tam
'tufted topper' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tam that I've seen before include "Scotsman's cap" , "These ratings measure TV audiences" , "TV audience ratings" , "...-o'-shanter, Scottish cap" , "'Woollen cap of Scottish origin, in short (3)'" .)