Hibernian flag at front of hotel (5)
I believe the answer is:
irish
'hibernian' is the definition.
(I've seen this before)
'flag at front of hotel' is the wordplay.
'flag' becomes 'iris' ('iris' can be a synonym of 'flag').
'at front of' is a charade indicator (letters next to each other).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'iris'+'h'='IRISH'
(Other definitions for irish that I've seen before include "Eg, native to Dublin" , "From Eire" , "Native to Erin" , "Hi, Sir, become a national" , "Joyce was" .)