Speak of making a comeback, too (5)
I believe the answer is:
refer
'speak' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for refer that I've seen before include "Hand over for decision" , "Advert, mention" , "Make allusion, or turn to for information" , "Send or direct to a specialist" , "Advert, cite" .)