Crossword Genius

Sending transmission around post (10)

Ross

I believe the answer is:

airmailing

'sending' is the definition.
(airmailing is a kind of sending)

'transmission around post' is the wordplay.
'transmission' becomes 'airing' (airing is a kind of transmission).
'around' means one lot of letters goes inside another.
'post' becomes 'mail' (synonyms).
'airing' enclosing 'mail' is 'AIRMAILING'.

I've seen this clue in The Daily Express.
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