Crossword Genius

Broadcast medium mostly one that’s a spokesperson’s business? (5)

Ross

I believe the answer is:

radii

'that's a spokesperson's business?' is the definition.
(plural of 'radius', which can mean a spoke)

'broadcast medium mostly one' is the wordplay.
'broadcast medium' becomes 'radio' (radio is a broadcast medium).
'mostly' means to remove the last letter.
'one' becomes 'i' (Roman numeral).
'radio' with its last letter taken off is 'radi'.
'radi'+'i'='RADII'

(Other definitions for radii that I've seen before include "Lines drawn from a circle's centre" , "Lines from a circle's centre to the circumference" , "Two making up diameter" , "parts for arms" , "spoke with others" .)

I've seen this clue in The Times.
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