Predict supporting online performers? (8)
I believe the answer is:
forecast
'predict' is the definition.
(forecasting is a kind of predicting)
'supporting online performers?' is the wordplay.
'supporting' becomes 'for'.
'online' becomes 'e' (as in e-mail or e-commerce).
'performers?' becomes 'cast' (I've seen this before).
'for'+'e'+'cast'='FORECAST'
(Other definitions for forecast that I've seen before include "Predict (event)" , "Prophecy" , "tip" , "Divine" , "Predict as with weather" .)