Like "To be or not to be” (6)
I believe the answer is:
'like to be or not to be' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iambic that I've seen before include "In ti-tum rhythm" , "Using short-long metrical feet" , "Kind of metric foot in poetry" , "Kind of verse form with lines of five feet, each with two syllables" , "- Pentameter is heroic verse form" .)