Devastating outbreak involving strange pains and bizarre flush (7,3)
I believe the answer is:
spanish flu
'devastating outbreak' is the definition.
I know nothing about this answer so I can't tell whether this works.
'strange pains and bizarre flush' is the wordplay.
'strange' indicates an anagram.
'and' is a charade indicator (letters next to each other).
'bizarre' is an anagram indicator.
'pains' anagrammed gives 'spani'.
'flush' is an anagram of 'shflu'.
'spani'+'shflu'='SPANISH FLU'
'involving' acts as a link.
Can you help me to learn more?
(Another definition for spanish flu that I've seen is " Cause of 1918 pandemic".)