Separate audition for a role (5)

I believe the answer is:

apart

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

'separate' is the definition.
(similar in meaning)

'audition for a role' is the wordplay.
'audition' becomes 'a' (this could be a standard abbreviation of which I'm unaware).
'for' says to put letters next to each other.
'a role' becomes 'part' (eg a part or role in a film).
'a'+'part'='APART'

Can you help me to learn more?

(Other definitions for apart that I've seen before include "Unconnected" , "In private" , "Separately, aside" , "away" , "First Christmas present from my love" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app