Rarely digress from prima donna scandal? (8)
I believe the answer is:
divagate
'rarely digress' is the definition.
(rare term for 'digress')
'prima donna scandal?' is the wordplay.
'prima donna' becomes 'diva' ('diva' can be a synonym of 'prima donna').
'scandal?' becomes 'gate' (as in Watergate and other formations).
'diva'+'gate'='DIVAGATE'
'from' acts as a link.
(Other definitions for divagate that I've seen before include "Stray, digress" , "Go off course" .)