The most common and most likely answer to this crossword clue is the 6 letter word UNABLE
I've seen this crossword clue in Financial Times
U
N
A
B
L
E
More clues leading to the result UNABLE
- Powerless and impossible to operate without us
- Powerless when nebula spreads
- Effete, upper-class outlaw upset by the French
- Diffuse nebula lacking in strength
- Not qualified to analyse nebula
- Incompetent way to leave tottering (6
- Inadequate peacekeeping force bale out
- Powerless to arrest student with drug joining university
- Available after swapping partner that’s impotent
- Lacking part of machine-gun, a Blenheim is powerless
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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 UNABLE mean?
UNABLE adjective- Not able; lacking a certain ability.
- To render unable; disable