What begins where boring Greek character mostly lived (5)

I believe the answer is:
dwelt
'mostly lived' is the definition.
'dwelt' can be an answer for 'lived' (I've seen this in another clue). I am unsure of the 'mostly' bit.
'what begins where boring greek character' is the wordplay.
'what begins' suggests taking the first letters (the letter that begins the word).
'boring' means one lot of letters goes inside another (some letters must 'bore' a hole into other letters).
'greek character' becomes 'delt' (I can't justify this - if you can you should believe this answer much more).
The initial letter of 'where' is 'w'.
'w' placed within 'delt' is 'DWELT'.
Can you help me to learn more?
(Other definitions for dwelt that I've seen before include "Inhabited" , "lodged" , "Focused anxiously" , "Persistently thought" , "was established" .)
