Is hard perhaps but may be eaten (6)
I believe the answer is:
radish
'may be eaten' is the definition.
I can't judge whether this defines the answer.
'is hard perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'is'+'hard'='ishard'
'ishard' anagrammed gives 'RADISH'.
'but' acts as a link.
Can you help me to learn more?
(Other definitions for radish that I've seen before include "Hottish salad plant" , "Red cold salad ingredient" , "Sir had this vegetable" , "Root vegetable used in salads" , "Root eaten raw in salads" .)