Hazardous lead-in for Radio 1 broadcaster (5)

I believe the answer is:

risky

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'hazardous' is the definition.
(synonyms)

'lead-in for radio 1 broadcaster' is the wordplay.
'lead in for radio' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'r' becomes 'I' (Roman numeral).
'broadcaster' becomes 'sky' (Sky is a television company).
'r'+'i'+'sky'='RISKY'

Can you help me to learn more?

(Other definitions for risky that I've seen before include "Hazardous" , "Speculative" , "admitting possibility of unpleasant outcome" , "taking a chance" , "Involving a chance of danger" .)

I've seen this clue in The Times.

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