Very lightly cooked meat (4)
I believe the answer is:
rare
'very lightly cooked meat' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rare that I've seen before include "Ben Jonson was considered so" , "Bloody (of steaks)" , "little done?" , "'Unusual, uncommon (4)'" , "Scarcely seen" .)