Charge execs for advertising spaces (10)
I believe the answer is:
billboards
'charge execs' is the definition.
The definition suggests a plural noun which matches the answer.
'advertising spaces' is the wordplay.
'advertising' becomes 'billboard' (I've seen this before).
'spaces' becomes 's' (this could be a standard abbreviation which I don't know about).
'billboard'+'s'='BILLBOARDS'
'for' is the link.
Can you help me to learn more?
(Another definition for billboards that I've seen is " More than one hoarding".)