Once a TV broadcast is ready, used in some countries (7)
I believe the answer is:
centavo
'ready used in some countries' is the definition.
(ready can mean cash)
'once a tv broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'once'+'a'+'tv'='onceatv'
'onceatv' anagrammed gives 'CENTAVO'.
'is' acts as a link.
(Other definitions for centavo that I've seen before include "A little money" , "money abroad" , "Small coin of Mexico, Brazil, etc" , "Foreign money" , "Mexican coin" .)