Lightly cooked in bar area (4)
I believe the answer is:
rare
'lightly cooked' is the definition.
(I've seen this in another clue)
'in bar area' is the wordplay.
'in' indicates a hidden word.
'RARE' can be found hidden inside 'bar area'.
(Other definitions for rare that I've seen before include "Unusual(ly fine)" , "difficult to find?" , "Seldom - unusual" , "(Of meat) red" , "Rear up to be uncommon" .)