Give out mite mixture (4)
I believe the answer is:
emit
'give out' is the definition.
('emit' can be a synonym of 'give out')
'mite mixture' is the wordplay.
'mixture' indicates an anagram.
'mite' with letters rearranged gives 'EMIT'.
(Other definitions for emit that I've seen before include "Give out (eg light)" , "Expel" , "Discharge - utter" , "Small turtle" , "Conductor; telegram (US)" .)