Crossword Genius

Said the letter travels by air (3)

Ross

I believe the answer is:

bee

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'said the letter travels by air' is the definition.
I can't tell whether this definition defines the answer.

'said the letter' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'the letter' becomes 'b'.
'b' is a homophone of 'BEE'.

Can you help me to learn more?

(Other definitions for bee that I've seen before include "Busy buzzer" , "Hive worker" , "Insect that bumbles?" , "Hymenopterous insect" , "Honey generator" .)

I've seen this clue in the Evening Standard.
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