As lute starts, organ starts too (4)
I believe the answer is:
also
'too' is the definition.
(synonyms)
'as lute starts organ starts' is the wordplay.
'starts' says to take the initial letters.
The first letters of 'as lute starts organ' is 'ALSO'.
(Other definitions for also that I've seen before include "As well, in addition" , "an indication of more to come" , "Item" , "into the bargain" , "To boot" .)