American getting ten out of ten at the space centre (5)
I believe the answer is:
texan
'american' is the definition.
(Texan is an example)
'ten out of ten at the space centre' is the wordplay.
'out of' means one lot of letters goes inside another.
'ten' becomes 'x' (roman numeral).
'at' is a charade indicator (letters next to each other).
'centre' says to take the centre.
The centre of 'space' is 'a'.
'x'+'a'='xa'
'ten' placed around 'xa' is 'TEXAN'.
'getting' is the link.
(Other definitions for texan that I've seen before include "Inhabitant of Dallas?" , "Eg, native of Dallas" , "Native of Dallas, say" , "Person from Austin, USA?" , "Relating to a US state" .)