Celebrity: extremely risky to like the Sky at Night? (6)
I believe the answer is:
starry
'like the sky at night?' is the definition.
(stars can be seen in the night sky)
'celebrity extremely risky' is the wordplay.
'celebrity' becomes 'star' (I've seen this in another clue).
'extremely' means to remove the middle letters (only the extremes of the word are used).
'risky' with its middle removed is 'ry'.
'star'+'ry'='STARRY'
'to' acts as a link.
(Other definitions for starry that I've seen before include "Description of Orion" , "after dark, it's clear" , "Like the night, perhaps" , "Like unclouded night" , "(Of the night sky) sparkling" .)