Somewhat saucy and kind of blue (4)
I believe the answer is:
cyan
'blue' is the definition.
(I have seen 'Greenish blue ' mean 'cyan' so perhaps 'blue' could also mean 'cyan')
'somewhat saucy and kind' is the wordplay.
'somewhat' indicates a hidden word.
'CYAN' is hidden within 'saucy and kind'.
'of' acts as a link.
(Other definitions for cyan that I've seen before include "Printer's blue" , "Bluish green" , "Greenish blue" , "Blue printing ink" , "Greenish-blue colour complementary to red" .)