Use fan on the blink? That’s risky (6)
I believe the answer is:
unsafe
'risky' is the definition.
('unsafe' can be similar in meaning to 'risky')
'use fan on the blink?' is the wordplay.
'on the blink?' indicates an anagram (informal phrase meaning 'not working properly').
'use'+'fan'='usefan'
'usefan' is an anagram of 'UNSAFE'.
'that's' acts as a link.
(Other definitions for unsafe that I've seen before include "Dangerous - legally without basis" , "Hazardous" , "Unreliable" , "Risky - inadequately evidenced" , "Perilous" .)