Province in actual centre of Germany (5)
I believe the answer is:
realm
'province' is the definition.
(I've seen this before)
'actual centre of germany' is the wordplay.
'actual' becomes 'real' (synonyms).
'centre of' means to look at the middle letters.
The middle letter of 'germany' is 'm'.
'real'+'m'='REALM'
'in' acts as a link.
(Other definitions for realm that I've seen before include "Royal domain" , "Knowledge base" , "field of study" , "Area of influence" , "Empire - state" .)