Make prediction about opener for live band (4)
I believe the answer is:
belt
'band' is the definition.
(I've seen this before)
'make prediction about opener for live' is the wordplay.
'make prediction' becomes 'bet' (to bet is to make a prediction about something).
'about' is an insertion indicator.
'opener for' says to take the initial letters.
The initial letter of 'live' is 'l'.
'bet' going around 'l' is 'BELT'.
(Other definitions for belt that I've seen before include "Cincture" , "Zone - connecting strip" , "Sign of rank in karate" , "Article of clothing" , "Zone - hit" .)