Ravenous Shakers ate sandwiches (8)
I believe the answer is:
famished
'ravenous' is the definition.
(synonyms)
'shakers ate sandwiches' is the wordplay.
'shakers' becomes 'amish' (I can't justify this - if you can you should believe this answer much more).
'ate' becomes 'fed' ('feed' can be a synonym of 'eat').
'sandwiches' indicates putting letters inside (to sandwich is to block something in).
'amish' going inside 'fed' is 'FAMISHED'.
Can you help me to learn more?
(Other definitions for famished that I've seen before include "Is fed ham, being very hungry" , "Extremely hungry" , "Ma fished, being starved" .)