Logic a heavy drinker won’t like, apparently (9)
I believe the answer is:
rationale
'logic' is the definition.
(I've seen this before)
'a heavy drinker won't like apparently' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'drinker' could be 'ale' (ale drinker is a kind of drinker) and 'ale' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rationale that I've seen before include "Philosophy" , "Motivation" , "explanation" , "grounds?" , "Why regulate" .)