Make official statement supporting insurance case (8)
I believe the answer is:
proclaim
'make official statement supporting insurance case' is the definition.
I can't judge whether this defines the answer.
'supporting insurance case' is the wordplay.
'supporting' becomes 'pro' (being pro something is supporting it).
'insurance case' becomes 'claim' (I've seen this in another clue).
'pro'+'claim'='PROCLAIM'
Can you help me to learn more?
(Other definitions for proclaim that I've seen before include "Make a public announcement" , "Reveal" , "Broadcast" , "Declare formally" , "Announce officially or declare publicly" .)