Kind of steak that is rarely served (9)
I believe the answer is:
underdone
'kind of steak that is rarely served' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for underdone that I've seen before include "Not cooked enough" , "raw!" , "could be rare" , "Not sufficiently cooked" , "Inadequately cooked" .)