The most common and most likely answer to this crossword clue is the 5 plus 4 letter word HANDS DOWN
I've seen this crossword clue in The Guardian
H
A
N
D
S
D
O
W
N
More clues leading to the result HANDS DOWN
- Gives to heirs with no difficulty
- Very simply, the opposite of a surrender demand?
- Easily passes with professor coming round
- Workers not working with complete ease
- Workers feeling miserable easily
- Workers not working comfortably
- Employees will get depressed very easily
- Simply leaves
- Passes on with ease
- Workers getting depressed easily
Buddy explains!

The straight part
We know that "comfortably" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case comfortably = hands down.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.