Rave (4)
'rave' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for rant that I've seen before include "Angry outburst" , "Wild speech" , "Talk wildly, rave" , "Angry tirade" , "Rail" .)
'rave' is the definition.
(to rave about something is to enthuse about it)
This is all the clue.
(Other definitions for enthuse that I've seen before include "Express eager enjoyment, interest or approval" , "Gush in praise" , "Show strong approval" , "Make (someone) interested and excited" , "Show passionate zeal (about something)" .)