Crossword Genius

Main unit for broadcasters opening in Yale? (7)

Ross

I believe the answer is:

keyhole

'opening in yale?' is the definition.
(Yale is a type of lock)

'main unit for broadcasters' is the wordplay.
'main' becomes 'key'.
'unit' becomes 'whole' (a whole unit of something).
'for broadcasters' indicates a 'sounds like' (homophone) clue (how the word might sound over a broadcast).
'whole' sounds like 'hole'.
'key'+'hole'='KEYHOLE'

(Other definitions for keyhole that I've seen before include "Opening for the opener" , "Aperture in lock - kind of surgery" , "Aperture for lock opening" , "Type of surgery" , "Opening in door etc" .)

I've seen this clue in The Times.
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