Cryptic crossword clue
Liberal Democrats initially anger PM, a sin taking more than one seat? 12

The most common and most likely answer to this crossword clue is the 12 letter word MANSPREADING

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "taking more than one seat?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case taking more than one seat? = manspreading.
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 MANSPREADING mean?

MANSPREADING noun
  1. The practice of men splaying their legs open wide when sitting on public transport, thus occupying more than one seat.

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