Old hotel tonight -- no different! (4,2,3,5)
I believe the answer is:
long in the tooth
'old' is the definition.
(I've seen this before)
'hotel tonight no different' is the wordplay.
'different' indicates an anagram.
'hotel'+'tonight'+'no'='hoteltonightno'
'hoteltonightno' is an anagram of 'LONG IN THE TOOTH'.
(Other definitions for long in the tooth that I've seen before include "over the hill?" , "ancient?" , "indication of the need for cosmetic dentistry?" , "Was a woolly mammoth" , "aged" .)