Turning blue, he's getting runs (6)
I believe the answer is:
dashes
'runs' is the definition.
(I know this)
'turning blue he's getting' is the wordplay.
'turning' is a reversal indicator.
'blue' becomes 'sad' (similar in meaning).
'getting' means one lot of letters go next to another.
'sad' back-to-front is 'das'.
'das'+'hes'='DASHES'
(Other definitions for dashes that I've seen before include "Strokes" , "flies!" , "Runs fast with shades" , "Darts" , "Quick run or sudden rush" .)