Cryptic crossword clue
Base crucial for walk, a lighthouse 6

The most common and most likely answer to this crossword clue is the 6 letter word ALKALI

A
L
K
A
L
I


Buddy explains!

The straight part
We know that "Base" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case base = alkali.
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 ALKALI mean?

ALKALI noun
  1. One of a class of caustic bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
  2. (Western United States) Soluble mineral matter, other than common salt, contained in soils of natural waters.

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