Send out Estonian initially, with German (4)
I believe the answer is:
emit
'send out' is the definition.
'estonian initially with german' is the wordplay.
'initially' indicates taking the first letters.
'with german' becomes 'mit'.
The initial letter of 'estonian' is 'e'.
'e'+'mit'='EMIT'
(Other definitions for emit that I've seen before include "Small turtle" , "Let out" , "Broadcast" , "Make audible sounds" , "Send forth" .)