Service ends prematurely with hotel food (4)
I believe the answer is:
mash
'food' is the definition.
(mashed potato)
'service ends prematurely with hotel' is the wordplay.
'service ends prematurely' becomes 'mas' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'mas'+'h'='MASH'
Can you help me to learn more?
(Other definitions for mash that I've seen before include "Pured potato" , "Animal feed" , "It goes well with sausages" , "Accompaniment of bangers" , "Reduce to pulp" .)