Distinguishing feature of hotel brand welcoming everybody (8)
I believe the answer is:
hallmark
'distinguishing feature' is the definition.
(I've seen this before)
'hotel brand welcoming everybody' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'brand' becomes 'mark' ('mark' can be a synonym of 'brand').
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'everybody' becomes 'all' (I've seen this before).
'h'+'mark'='hmark'
'hmark' going around 'all' is 'HALLMARK'.
'of' is the link.
(Other definitions for hallmark that I've seen before include "Stamp of authority" , "Distinctive feature" , "Sign of authenticity or excellence" , "Sign of authenticity (eg of silver)" , "Genuine impression" .)