Alleged communist supports party dropping Republican (7)
I believe the answer is:
averred
'alleged' is the definition.
('aver' can be a synonym of 'allege')
'communist supports party dropping republican' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'supports' says to put letters next to each other (bottom letters provide a support for the top ones).
'party' becomes 'ave' (I can't justify this - if you can you should believe this answer much more).
'dropping' suggests taking the first letters (I've seen 'drop of' mean this).
The initial letter of 'republican' is 'r'.
'ave'+'r'='aver'
'red' after 'aver' is 'AVERRED'.
Can you help me to learn more?
(Other definitions for averred that I've seen before include "Held" , "Claimed" , "Stated, asserted" , "Maintained" , "confidently stated" .)