Outside broadcast for scale (8)
I believe the answer is:
alfresco
'outside' is the definition.
(synonyms)
'broadcast for scale' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'for'+'scale'='forscale'
'forscale' anagrammed gives 'ALFRESCO'.
(Other definitions for alfresco that I've seen before include "In the open air" , "exposed to the fresh air" , "Meal eaten in the outdoors" , "Located outdoors" , "Outdoors, meal perhaps" .)