Cryptic crossword clue
Mentally unbalanced setter joining most of staff in place to have a drink 7

The most common and most likely answer to this crossword clue is the 7 letter word BIPOLAR

I've seen this crossword clue in The Guardian
B
I
P
O
L
A
R

Buddy explains!

The straight part
We know that "Mentally unbalanced" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mentally unbalanced = bipolar.
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 BIPOLAR mean?

BIPOLAR noun
  1. A bipolar cell.
  2. Short for bipolar disorder and bipolarity.
BIPOLAR adjective
  1. Involving or having both extremes or poles at the same time.
  2. Relating to both polar regions
  3. Relating to a bipole
  4. Relating to or having bipolar disorder.
  5. Of or relating to an international system in which two states wield most of the cultural, economic, and political influence.

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