Crossword Genius

Kind of steak that is rarely served (9)

Ross

I believe the answer is:

underdone

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'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.

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(Other definitions for underdone that I've seen before include "Not cooked enough" , "raw!" , "could be rare" , "Not sufficiently cooked" , "Inadequately cooked" .)

I've seen this clue in The Globe and Mail.
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