The most common and most likely answer to this crossword clue is the 8 letter word CHEERILY
I've seen this crossword clue in The Daily Telegraph
C
H
E
E
R
I
L
Y
More clues leading to the result CHEERILY
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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 CHEERILY mean?
CHEERILY adverb- In a cheerful manner; with a cheery demeanour.