Crossword Genius

Our airmen go up a lot (3)

Ross

I believe the answer is:

far

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

'a lot' is the definition.
Both the definition and answer are adverbs. Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for far that I've seen before include "Distant" , "Very much" , "At a great distance way" , "A long, long way to go" , "Remote" .)

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