Star gets unusual part (3)
I believe the answer is:
sun
'star' is the definition.
(the Sun is a star)
'gets unusual part' is the wordplay.
'part' says the answer is hidden in the clue.
'SUN' can be found hidden inside 'gets unusual'.
(Other definitions for sun that I've seen before include "Bask" , "Major star" , "Fireball 93,000,000 miles away" , "Earth's nearest star" , "Warmer" .)