Cryptic crossword clue
Versatile bar pianist having broad support 10

The most common and most likely answer to this crossword clue is the 10 letter word BIPARTISAN

I've seen this crossword clue in Financial Times
B
I
P
A
R
T
I
S
A
N


Buddy explains!

The straight part
We know that "having broad support" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having broad support = bipartisan.
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 BIPARTISAN mean?

BIPARTISAN adjective
  1. Relating to, or supported by two groups, especially by two political parties

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