Smile while using gymnastic apparatus (4)

I believe the answer is:

beam

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

This clue might be a double definition.

'smile while' is the first definition.
'beam' can be an answer for 'smile' (to beam is to smile). I'm not sure about the 'while' bit.

'gymnastic apparatus' is the second definition.
(I know that beam is a type of gymnastic apparatus)

'using' acts as a link.

Can you help me to learn more?

(Other definitions for beam that I've seen before include "Give a wide smile" , "Supporting structure" , "Smile widely; ray" , "Smile, light shaft" , "Sturdy timber" .)

I've seen this clue in The Irish Times.

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.