Brewing ale with pub machine that's 100% reliable (13)
I believe the answer is:
unimpeachable
'reliable' is the definition.
(thesaurus)
'brewing ale with pub machine' is the wordplay.
'brewing' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'pub'+'machine'='pubmachine'
'ale' after 'pubmachine' is 'pubmachineale'.
'pubmachineale' with letters rearranged gives 'UNIMPEACHABLE'.
'that's 100%' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for unimpeachable that I've seen before include "Blameless" , "Beyond doubt or reproach" .)