Figure of speech suggesting something really is what it resembles (8)
I believe the answer is:
metaphor
'figure of speech suggesting something really is what it resembles' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for metaphor that I've seen before include "To hamper, badly, a figure of speech" , "Top harem is a figure of speech" , "A common fugure of speech" , "That's not to be taken literally" , "Figure of speech that directly indicates a likeness" .)