Crossword Genius

Start driving on a course (3,3)

Ross

I believe the answer is:

tee off

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

This might be a double definition.

'start' is the first definition.
(I've seen this before)

'driving on a course' is the second definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for tee off that I've seen before include "Start a round of golf" , "Start playing golf" , "start using iron" , "Start a golf game" , "Strike golf ball at beginning of each hole" .)

I've seen this clue in The Telegraph and The Globe and Mail.
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