Histrionic centre, we figure (5)
I believe the answer is:
three
'figure' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for three that I've seen before include "There (anag.)" , "Start to count back, briefly" , "Number of strikes before you're out" , "Number of feet in a yard" , "So many 12s today" .)