Dreamer ordered spacesuit, ditching uniform (8)
I believe the answer is:
escapist
'dreamer' is the definition.
(synonyms)
'ordered spacesuit ditching uniform' is the wordplay.
'ordered' is an anagram indicator.
'ditching' indicates named letters should be taken away.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'spacesuit' with 'u' taken away is 'spacesit'.
'spacesit' anagrammed gives 'ESCAPIST'.
(Other definitions for escapist that I've seen before include "One living in a fantasy world" , "Walter Mitty" , "One avoiding reality" , "My interest is not of this world" , "One who tries to avoid the harsh world" .)