Blasts odd idea for a movie (7)
I believe the answer is:
tootsie
'blasts' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'odd idea for a movie' is the wordplay.
'odd' indicates alternate letters.
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a movie' becomes 'toots' (I can't explain this - if you can you should give a lot more credence to this answer).
The alternate letters of 'idea' are 'ie'.
'ie' after 'toots' is 'TOOTSIE'.
Can you help me to learn more?
(Other definitions for tootsie that I've seen before include "Film with Dustin Hoffman" , "Child's word for toe" , "Foot or toe (childish)" , "Funnily enough, foot" , "Foot (jocular)" .)