Public address I'd settled the bill for (4)
I believe the answer is:
paid
'settled the bill for' is the definition.
'paid' can be an answer for 'settled' (paying is a kind of settling). I am unsure of the 'the bill for' bit.
'public address i'd' is the wordplay.
'public address' becomes 'pa' (this could be a standard abbreviation of which I'm unaware).
'pa'+'id'='PAID'
Can you help me to learn more?
(Other definitions for paid that I've seen before include "Trite phrase" , "Aggressive, rowdy" , "Remunerated" , "See 12" , "Hired" .)