The most common and most likely answer to this crossword clue is the 7 letter word RADIATE
I've seen this crossword clue in The Guardian
R
A
D
I
A
T
E
More clues leading to the result RADIATE
- Irish channel securing opera about to broadcast
- Excellent goddess inspiring one to shine
- Relief after rising in rank makes you beam
- TV station securing opera about to broadcast
- Spoke out in broadcast
- Opera served up in Irish TV company’s broadcast
- Shine as a result of help turning up in class
- Issue developing from head waiter ignoring that man and wife or a maitre d’ ignoring male
- Value securing help lifting beam
- Beam excellent? This compiler’s put away!
Buddy explains!

The straight part
We know that "to broadcast" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to broadcast = radiate.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RADIATE mean?
RADIATE noun- One of the Radiata.
- To extend, send or spread out from a center like radii.
- To emit rays or waves.
- To come out or proceed in rays or waves.
- To illuminate.
- To expose to ionizing radiation, such as by radiography.
- To manifest oneself in a glowing manner.
- (ecology, intransitive) to spread into new habitats, migrate.
- Radiating from a center; having rays or parts diverging from a center; radiated.
- Surrounded by rays, such as the head of a saint in a religious picture.
- Having parts radiating from the center, like the petals in many flowers.
- Consisting of a disc in which the florets are tubular.
- Having radial symmetry, like a seastar.
- Belonging to the Radiata.