Crossword Genius

With a directorship after flotation? (2,5)

Ross

I believe the answer is:

on board

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for on board that I've seen before include "Situated on ship" , "Installed inside a vehicle or craft" , "No B-road (anag.)" , "at the wheel?" , "using public transport?" .)

I've seen this clue in The Sun.
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.