Enough or sufficient (8)
I believe the answer is:
adequate
I believe this clue is a double definition.
'enough' is the first definition.
(I know that enough can be written as adequate)
'sufficient' is the second definition.
(similar in meaning)
(Other definitions for adequate that I've seen before include "Fair to middling" , "'Good enough, all right (8)'" , "Ample" , "Good enough, acceptable" , "Sufficient or all right" .)