Cryptic crossword clue
Back UK vote in front of Scotland’s leader? That’s bad in Perth 5

The most common and most likely answer to this crossword clue is the 5 letter word ONKUS

O
N
K
U
S

Buddy explains!

The straight part
We know that "That’s bad in Perth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that’s bad in perth = onkus.
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 ONKUS mean?

ONKUS adjective
  1. Inferior; unpleasant; unacceptably bad.

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