The most common and most likely answer to this crossword clue is the 10 letter word SUN-KISSED
I've seen this crossword clue in The Times
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More clues leading to the result SUN-KISSED
Buddy explains!

The straight part
We know that "basking in a warm glow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case basking in a warm glow = sun-kissed.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 SUN-KISSED mean?
SUN-KISSED adjective- Sunny (receiving lots of sun)
- Made warm or brown from the sun
- Darker skinned through sun exposure