Crossword Genius

On which to speak, or possibly play guitar (7)

Ross

I believe the answer is:

rostrum

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

'on which to speak' is the definition.
I can't judge whether this defines the answer.

'or possibly play guitar' is the wordplay.
'possibly' indicates an anagram.
'play guitar' becomes 'strum' (to strum is to play a guitar).
'or' with letters rearranged gives 'ro'.
'ro'+'strum'='ROSTRUM'

Can you help me to learn more?

(Other definitions for rostrum that I've seen before include "place for speaker" , "Platform for public speaking" , "stage" , "Platform for speaker" , "beak" .)

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