Having lost tablets, unfortunately, late leaving for jaunt (9)

I believe the answer is:

gallivant

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

'for jaunt' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for gallivant that I've seen before include "run around" , "play around" , "Go in search of fun" , "Flit about" , "follow the primrose path" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.