Alfresco or outside exercises in a broadcast (4-3)
I believe the answer is:
open-air
'alfresco' is the definition.
(I know that alfresco can be written as open-air)
'or outside exercises in a broadcast' is the wordplay.
'outside' is an insertion indicator (some letters go outside others).
'exercises' becomes 'pe' (Physical Education).
'broadcast' is an anagram indicator (letters scattered or cast around).
'in'+'a'='ina'
'ina' is an anagram of 'nai'.
'pe'+'nai'='penai'
'or' placed around 'penai' is 'OPEN-AIR'.
(Other definitions for open-air that I've seen before include "Taking place outdoors" , "Outdoor" , "Exposed to the elements" , "Alfresco" , "not below roof" .)