Study of outer space that could be made from cosy starship (12)
I believe the answer is:
astrophysics
'study of outer space' is the definition.
'made from cosy starship' is the wordplay.
'made from' indicates anagramming the letters.
'cosy'+'starship'='cosystarship'
'cosystarship' is an anagram of 'ASTROPHYSICS'.
'that could be' is the link.
(Other definitions for astrophysics that I've seen before include "Science of the properties of celestial bodies" , "Science of stars and galaxies" , "Branch of science" .)