A base from which one must walk a little distance (6)
I believe the answer is:
alkali
'a base' is the definition.
(I know that alkali can be written as alkali)
'which one must walk a little distance' is the wordplay.
'ALKALI' is hidden within the letters.
But, I am unsure how the hidden word is indicated.
'from' is the link.
Can you help me to learn more?
(Other definitions for alkali that I've seen before include "Substance that neutralises acid" , "Compound turning litmus blue" , "Eg, lime or caustic soda" , "Substance such as lime or caustic soda" , "Soluble compound that turns litmus paper blue" .)