The most common and most likely answer to this crossword clue is the 7 letter word RADIANT
I've seen this crossword clue in Independent
R
A
D
I
A
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More clues leading to the result RADIANT
- Notice one in angry discourse exuding heat?
- Incandescent tirade about squandered aid
- Beaming traitor keeps lead from DI Fleming?
- Notice one in tirade incandescent
- A Democrat stops laughing and beaming
- Beaming, getting help back in storm
- A little woman in rave beaming
- Brilliant mathematician’s angle, central feature of lecture
- Magnificent harangue about returned benefit
- Worker on set mostly looking happy
Buddy explains!

The straight part
We know that "beaming" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case beaming = radiant.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 RADIANT mean?
RADIANT noun- A point source from which radiation is emitted.
- The apparent origin, in the night sky, of a meteor shower.
- A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
- Radiating light and/or heat.
- Emitted as radiation.
- Beaming with vivacity and happiness.
- Emitting or proceeding as if from a center.
- Giving off rays; said of a bearing.
- Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.