27 across
Yes,
bad
mood
may
be
aggravated
by
merely
adequate
historic
records
(8,4)
Yes, bad mood may be aggravated by merely adequate historic records (8,4)
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The definition is at the end of the clue.
How the clue works
The definition here is historic records, pointing to the famous medieval survey. 'Yes bad mood' gets jumbled (as hinted by 'aggravated') into DOMESDAYBO, and then you tack on OK, meaning 'merely adequate', to finish it off — giving you the full answer.