Crossword Genius

False rocks fenced by lady in charge of racket, 50 per cent off? (4-6)

Ross

I believe the answer is:

half-asleep

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

'cent off?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'false rocks fenced by lady in charge of racket 50 per' is the wordplay.
I cannot quite see how this works, but
an anagram of 'false' is 'fasle' which is within the answer.
'50' could be 'l' (Roman numeral) and 'l' is present in the answer.
'per' could be 'a' and 'a' is present in the answer.
The remaining letters 'hep' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for half-asleep that I've seen is " Semicomatose".)

I've seen this clue in The Telegraph.
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