Blast road built by first woman (7)
I believe the answer is:
pandora
'first woman' is the definition.
(I've seen this before)
'blast road built by' is the wordplay.
'blast' becomes 'pan' (I can't explain this - if you can you should believe this answer much more).
'built' indicates anagramming the letters.
'by' means one lot of letters go next to another.
'road' anagrammed gives 'dora'.
'pan'+'dora'='PANDORA'
Can you help me to learn more?
(Other definitions for pandora that I've seen before include "Her box was filled with all the ills of the world" , "First lady" , "In Greek myth, the first woman with disastrous Box" , "First mortal woman of Greek mythology" , "toxic container carrier" .)