16 down
Declare
period
of
history
unexceptional
(7)
Declare period of history unexceptional (7)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Right, so unexceptional is your definition there, meaning ordinary or run-of-the-mill. For the wordplay, take AVER (to declare) and stick AGE (a period of history) on the end, and that gives you the answer.