Crossword Genius

Group of fliers intially start a journey (3,3)

Ross

I believe the answer is:

set off

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

'intially start a journey' is the definition.
I can't judge whether this definition defines the answer.

'group of fliers' is the wordplay.
'group' becomes 'set' (both can mean a collection).
'fliers' becomes 'f' (this could be a standard abbreviation which I don't know about).
'set'+'of'+'f'='SET-OFF'

Can you help me to learn more?

(Other definitions for set off that I've seen before include "Counterbalance" , "Display - mount - start journey" , "Begin journey or detonate bomb" , "Commence journey or detonate" , "Leave - explode" .)

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