Crossword Genius

Transmitting a single short melody (2,3)

Ross

I believe the answer is:

on air

'transmitting' is the definition.
(eg transmitting on the radio)

'a single short melody' is the wordplay.
'a single' becomes 'one' (a single thing - only one).
'short' means to remove the last letter.
'melody' becomes 'air' (synonyms).
'one' with its last letter taken away is 'on'.
'on'+'air'='ON-AIR'

(Other definitions for on air that I've seen before include "with audience?" , "How one walks when elated" , "very happily?" , "Live broadcast" , "Transmitting now!" .)

I've seen this clue in The Guardian.
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