The most common and most likely answer to this crossword clue is the 8 letter word CAREFREE
I've seen this crossword clue in The Times
C
A
R
E
F
R
E
E
More clues leading to the result CAREFREE
- Canadian native coming across a person with whistle and light
- Very relaxed about heartless sports official
- Happy having supervision without charge
- Happy-go-lucky benefit of the welfare state?
- Unconcerned about heartless arbiter
- Pedestrianised to save energy without responsibility
- Unlikely offer from private nursing home is nonchalant
- Relaxed about umpire ignoring first of extras
- Like Herm and Sark, keeping people ultimately untroubled
- Unconcerned when soldiers turn up in church to take Frank
Buddy explains!

The straight part
We know that "light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light = carefree.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 CAREFREE mean?
CAREFREE adjective- Without cares or worries; free of concern or worries; without difficulty.