Crossword Genius

Give terrible review about one worse on stage (7)

Ross

I believe the answer is:

hammier

I'm a little stuck... Click here to teach me more about this clue!

'give terrible review about' is the definition.
I can't judge whether this defines the answer.

'one worse on stage' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
The remaining letters 'hammer' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
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