Normal to declare time (7)
I believe the answer is:
average
'normal' is the definition.
(similar in meaning)
'declare time' is the wordplay.
'declare' becomes 'aver' (averring is a kind of declaring).
'time' becomes 'age' (an age is a period of time).
'aver'+'age'='AVERAGE'
'to' acts as a link.
(Other definitions for average that I've seen before include "Medium; normal" , "mean maybe" , "nothing special" , "par" , "About normal or usual" .)