Crossword Genius

An airborne carrier (6)

Ross

I believe the answer is:

pigeon

I'm a little stuck... Click here to teach me more about this clue!

'an airborne carrier' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for pigeon that I've seen before include "Town and woodland bird" , "Dupe" , "Bird with heavy body and short legs" , "birdie" , "See 5" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app