Crossword Genius

Brilliant episode for one cast? (5,5)

Ross

I believe the answer is:

magic spell

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

'one cast?' is the definition.
(spells can be cast)

'brilliant episode' is the wordplay.
'brilliant' becomes 'magic' (I can't justify this - if you can you should give a lot more credence to this answer).
'episode' becomes 'spell' (both can mean a period of time).
'magic'+'spell'='MAGIC SPELL'

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Times.
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