Crossword Genius

General disorder spread this year after service (4,8)

Ross

I believe the answer is:

mass hysteria

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'general disorder' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'spread this year after service' is the wordplay.
'spread' is an anagram indicator.
'after' is a charade indicator (letters next to each other).
'service' becomes 'mass' (kind of church service).
'this'+'year'='thisyear'
'thisyear' with letters rearranged gives 'hysteria'.
'hysteria' after 'mass' is 'MASS HYSTERIA'.

Can you help me to learn more?

(Other definitions for mass hysteria that I've seen before include "caused by church service?" , "General panic" , "Frenzy" .)

I've seen this clue in The Daily Express.
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