Fair enough! (6)
This clue is a double definition.
'fair' is the first definition.
(synonyms)
'enough' is the second definition.
(synonyms)
(Other definitions for adequate that I've seen before include "Sufficient, good enough" , "'Satisfactory, acceptable (8)'" , "'Good enough, all right (8)'" , "Enough to meet a purpose" , "up to the job?" .)
(Other definitions for touche that I've seen before include "cry from fencer" , "Acknowledgment of a hit in fencing" , "Acknowledgment of hit by fencer" , "Fencing call" , "You got me" .)