Star (3)
'star' is the definition.
(the Sun is a star)
This is all the clue.
(Other definitions for sun that I've seen before include "Centre of Earth's orbit" , "Earth's nearest star" , "Helios, in Greek myth" , "Star; paper" , "Our central star" .)
'star' is the definition.
(I know that star can be written as asterisk)
This is the entire clue.
(Other definitions for asterisk that I've seen before include "Character drawing attention to footnote" , "Star-like symbol as reference mark" , "Textual reference symbol" , "Printer's star" , "Printed star" .)
'star' is the definition.
(I have seen 'bright star' mean 'comet' so perhaps 'star' could also mean 'comet')
This is all the clue.
(Other definitions for comet that I've seen before include "Tailed heavenly body" , "Heavenly visitor" , "5 [SKYLIGHT], perhaps?" , "Long distance traveller" , "Traveller round sun" .)
(Other definitions for trek that I've seen before include "Long difficult walk" , "Long and difficult trip" , "A long arduous walk" , "Tramp" , "Long walk in the mountains?" .)