Unripe grapes are too much for her (3)
I believe the answer is:
Here is my best explanation:
'her' is the definition.
(I've seen this before)
'unripe grapes are too much' is the wordplay.
'PEG' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.
'for' acts as a link.
Can you help me to learn more?