Strongly disliked misleading hotel ad (7)
I believe the answer is:
loathed
'strongly disliked' is the definition.
'misleading hotel ad' is the wordplay.
'misleading' indicates an anagram (I've seen this in other clues).
'hotel'+'ad'='hotelad'
'hotelad' anagrammed gives 'LOATHED'.
(Other definitions for loathed that I've seen before include "Detested and abominated" , "Hated" , "'Abhorred, detested (7)'" , "Regarded with disgust and hatred" , "Cordially detested" .)