The most common and most likely answer to this crossword clue is the 6 letter word STROBE
I've seen this crossword clue in The Guardian
S
T
R
O
B
E
More clues leading to the result STROBE
- Saint has garment, something flashy
- Initially Super Trouper dress is light …
- Robert’s topless boobs flasher
- Worst or best flash light?
- A sort of light street dress
- Light suit’s outside garment
- Flashing light — still light
- Saint put on garment in flashing light
- Lightweight dressing gown
- Flashing light in bistro beckons
Buddy explains!

The straight part
We know that "Kind of light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kind of light = strobe.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 STROBE mean?
STROBE noun- A stroboscopic lamp: a device used to produce regular flashes of light.
- An electronic signal in hardware indicating that a value is ready to be read.
- To flash like a stroboscopic lamp.