Bar manager's initially done some cooking - hot pub grub, typically (7,3,4)
I believe the answer is:
bangers and mash
'grub typically' is the definition.
'bangers and mash' can be an answer for 'grub' (I've seen this before). I'm not sure about the 'typically' bit.
'bar manager's initially done some cooking hot pub' is the wordplay.
I cannot quite see how this works, but
'bar' could be 'ban' (bar can mean to ban or prohibit) and 'ban' is located in the answer.
'some' could be 'a' and 'a' is located in the answer.
'hot' could be 'h' (abbreviation eg on taps) and 'h' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bangers and mash that I've seen before include "Grub" , "Simple dish" , "course" , "That's for popular consumption" , "Sausage dish" .)