Crossword Genius

Announce day finally set (5)

Ross

I believe the answer is:

telly

'set' is the definition.
(I know that telly is a type of radio receiver)

'announce day finally' is the wordplay.
'announce' becomes 'tell'.
'finally' indicates one should take the final letters.
The last letter of 'day' is 'y'.
'tell'+'y'='TELLY'

(Other definitions for telly that I've seen before include "cop in seventies" , "The goggle-box" , "- - Savalas" , "Set" , "TV (colloq.)" .)

I've seen this clue in The Times.
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