Prevailing (8)
'prevailing' is the definition.
(I know that prevailing can be written as dominant)
This is all the clue.
(Other definitions for dominant that I've seen before include "alpha male?" , "Ascendant" , "Exercising influence or control" , "Having a commanding influence or towering over" , "Main, principal" .)
'prevailing' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for popular that I've seen before include "having many fans" , "Hot" , "In general favour" , "Non-technical" , "Fashionable" .)