Amazing lunar shot includes Earth (6)
I believe the answer is:
unreal
'amazing' is the definition.
(unreal can informally mean amazing or incredible)
'lunar shot includes earth' is the wordplay.
'shot' indicates an anagram.
'includes' indicates putting letters inside.
'earth' becomes 'E'.
'lunar' anagrammed gives 'unral'.
'unral' enclosing 'e' is 'UNREAL'.
(Other definitions for unreal that I've seen before include "Not actual or credible" , "Phantasmagorical" , "Not actually existing" , "Illusory; amazing" , "Not factual" .)