Henry moving to rear of centre ground (5)
I believe the answer is:
earth
'ground' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for earth that I've seen before include "our home" , "The 3rd planet from the sun" , "See 12" , "our present abode" , "Soil; fox's lair" .)