Cryptic crossword clue
In leaderless Britain, left without serious consideration 7

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

I've seen this crossword clue in The Guardian
L
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G
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L
Y

Buddy explains!

The straight part
We know that "without serious consideration" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case without serious consideration = lightly.
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 LIGHTLY mean?

LIGHTLY adverb
  1. In a light manner.

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