Crossword Genius

Clever person packaged undergarment? (8)

Ross

I believe the answer is:

brainbox

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

'clever person' is the definition.
(I've seen this before)

'packaged undergarment?' is the wordplay.
I cannot really see how this works, but
'undergarment?' could be 'bra' (bra is a kind of undergarment) and 'bra' is found in the answer.
The remaining letters 'inbox' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for brainbox that I've seen before include "Einstein?" , "Very clever figure" , "Clever type" , "Egghead" , "Very clever person" .)

I've seen this clue in The Telegraph.
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.