Star in Cygnus (5)
I believe the answer is:
deneb
'star in cygnus' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for deneb that I've seen before include "First magnitude star in Cygnus" , "Be Ned (anag) - brightest star in Cygnus" , "Bright star in Cygnus" , "Bright star; be end (anag.)" , "The star Alpha Cygni" .)