Minister touring a feature of Dungeness (7)
I believe the answer is:
reactor
'feature of dungeness' is the definition.
The definition suggests a singular noun which matches the answer.
'minister touring a' is the wordplay.
'minister' becomes 'rector' (synonyms).
'touring' is an insertion indicator (touring can mean going round).
'rector' going around 'a' is 'REACTOR'.
Can you help me to learn more?
(Other definitions for reactor that I've seen before include "nuclear vessel" , "See 3 Down" , "chemical substance!" , "Device to produce energy by nuclear fission" , "Nuclear energy source" .)