No time to talk with boxer in compound (6)
I believe the answer is:
'compound' is the definition.
(I know that alkali is a type of compound)
'no time to talk with boxer' is the wordplay.
I cannot quite see how this works, but
'boxer' could be 'ali' (Muhammad Ali) and 'ali' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for alkali that I've seen before include "Basic stuff" , "Substance that neutralises acid" , "Eg, lime or caustic soda" , "base solution" , "Soluble compound that turns litmus paper blue" .)