Emergency provision in hotel out of order (7)
I believe the answer is:
hotline
'emergency provision' is the definition.
(phone line used in an emergency)
'in hotel out of order' is the wordplay.
'out of order' is an anagram indicator.
'in'+'hotel'='inhotel'
'inhotel' anagrammed gives 'HOTLINE'.
(Other definitions for hotline that I've seen before include "Special phone link" , "Direct telephone link between two officials" , "Important number to call" , "critical link" , "Emergency blower" .)