The most common and most likely answer to this crossword clue is the 6 letter word EXEMPT
I've seen this crossword clue in Independent
E
X
E
M
P
T
More clues leading to the result EXEMPT
- Former lover abandoned, not entirely immune
- Release former partner, almost lacking emotion
- Central indexing deemed acceptable for one paying no tax
- Partner of old politician getting into film for free
- Spared parliamentarian in city abandoned by monarch
- Old film about politician not included
- Having no duties former employee casually taking time to finish
- Release many to drill under river
- Release former partner, almost gutted
- Grant immunity to European politician replacing one in withdrawal
Buddy explains!

The straight part
We know that "Having no duties" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having no duties = exempt.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 EXEMPT mean?
EXEMPT noun- One who has been released from something.
- A type of French police officer.
- One of four officers of the Yeomen of the Royal Guard, having the rank of corporal; an exon.
- To grant (someone) freedom or immunity from.
- Free from a duty or obligation.
- (of an employee or his position) Not entitled to overtime pay when working overtime.
- Cut off; set apart.
- Extraordinary; exceptional.