Diet including brewed ales and hot pork pie (9)
I believe the answer is:
falsehood
'pork pie' is the definition.
(I've seen this before)
'diet including brewed ales and hot' is the wordplay.
'diet' becomes 'food' (I can't explain this - if you can you should believe this answer much more).
'including' is an insertion indicator.
'brewed' is an anagram indicator.
'and' says to put letters next to each other.
'hot' becomes 'h' (common abbreviation eg on taps).
'ales'+'h'='alesh'
'alesh' is an anagram of 'alseh'.
'food' going around 'alseh' is 'FALSEHOOD'.
Can you help me to learn more?
(Other definitions for falsehood that I've seen before include "It might be hard to swallow" , "Fictional account" , "work of fiction" , "Pork pie" , "Deception" .)