Starting to arrange, for example, to bring forth the main body of water (6,3)
I believe the answer is:
aegean sea
'body of water' is the definition.
(Aegean Sea is an example)
'starting to arrange for example to bring forth the main' is the wordplay.
'starting to' suggests taking the first letters.
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'to bring forth' becomes 'ean' (I can't justify this - if you can you should believe this answer much more).
'the main' becomes 'sea' (the main is an old name for the sea).
The first letter of 'arrange' is 'a'.
'a'+'eg'+'ean'+'sea'='AEGEAN SEA'
Can you help me to learn more?
(Other definitions for aegean sea that I've seen before include "Where the Isles of Greece are" , "Part of the Mediterranean between Greece and Turkey" , "Greek island home?" , "Area around Greece" , "Main" .)