Obscure snippets in midst of tweets (7)
I believe the answer is:
eclipse
'obscure' is the definition.
(I know that eclipse is a type of overshadow)
'snippets in midst of tweets' is the wordplay.
'snippets' becomes 'clips' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'midst of' indicates the central letters.
The middle of 'tweets' is 'ee'.
'clips' placed into 'ee' is 'ECLIPSE'.
Can you help me to learn more?
(Other definitions for eclipse that I've seen before include "Lunar or solar phenomenon" , "Dull time for male duck" , "Shadowing of sun, etc" , "Over-shadow as the earth may the moon" , "Overshadow, obscure" .)