Mingle, blend (3)
I believe the answer is:
mix
This clue is a double definition.
'mingle' is the first definition.
(synonyms)
'blend' is the second definition.
(I know that blend can be written as mix)
(Other definitions for mix that I've seen before include "Associate" , "'Mingle, combine (3)'" , "Amalgamate, blend" , "Mingle, blend" , "Get on" .)