Pub on fire, engulfing end of kitchen where food's served (5,3)
I believe the answer is:
snack bar
'where food's served' is the definition.
'pub on fire engulfing end of kitchen' is the wordplay.
'pub' becomes 'bar' (I've seen this before).
'on' says to put letters next to each other.
'fire' becomes 'sack' (dismiss someone from their job).
'engulfing' indicates putting letters inside.
'end of kitchen' becomes 'n' (I can't explain this - if you can you should give a lot more credence to this answer).
'sack' going around 'n' is 'snack'.
'bar' after 'snack' is 'SNACK-BAR'.
(Other definitions for snack bar that I've seen before include "Inexpensive eatery" , "Light food outlet" , "buffet at the roadside" , "Lunch counter" , "Place to obtain light refreshments" .)