Publicity drive Queen's informally expecting (8)

I believe the answer is:

preggers

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

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

'publicity drive queen's informally' is the wordplay.
'publicity' becomes 'pr'.
'drive queen's informally' becomes 'eggers' (I can't justify this - if you can you should believe this answer much more).
'pr'+'eggers'='PREGGERS'

Can you help me to learn more?

(Another definition for preggers that I've seen is " Expecting".)

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