Great distance out in space, right? (6)
I believe the answer is:
parsec
'great distance' is the definition.
'parsec' can be an answer for 'distance' (I've seen this before). I am not sure about the 'great' bit.
'out in space right?' is the wordplay.
'out' indicates an anagram.
'right?' becomes 'r' (common abbreviation).
'space'+'r'='spacer'
'spacer' is an anagram of 'PARSEC'.
Can you help me to learn more?
(Other definitions for parsec that I've seen before include "Enormous distance" , "three and a quarter twenty sevens [LIGHT YEARS]" , "Unit of interstellar distance" , "unit for measuring distances" , "Unit of distance in space" .)