Sort of steak (6)
'sort of steak' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for t-bone that I've seen before include "Cut of beef" , "Choice cut of steak" , "Type of steak" , "Choice piece of loin steak" , "Large cut of steak" .)
(Another definition for tbone that I've seen is " structural member".)