Tell island about the missing hotel (7)
I believe the answer is:
narrate
'tell' is the definition.
('narrate' can be a synonym of 'tell')
'island about the missing hotel' is the wordplay.
'island' becomes 'arran' (I've seen this before**).
'about' is a reversal indicator.
'missing' is a deletion indicator.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'arran' backwards is 'narra'.
'the' with 'h' taken out is 'te'.
'narra'+'te'='NARRATE'
(Other definitions for narrate that I've seen before include "Set forth" , "Relate, recount" , "Chronicle" , "rehearse" , "Relate - portray" .)