Size limitation's no bar to Shakespeare's general leading army (5)
I believe the answer is:
quota
'size limitation's no' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'bar to shakespeare's general leading army' is the wordplay.
'bar' becomes 't' (T-bar is a part of a ski lift).
'to' means one lot of letters go next to another (I've seen this in other clues).
'shakespeare's general' becomes 'quo' (I can't justify this - if you can you should believe this answer much more).
'leading' indicates taking the first letters.
The initial letter of 'army' is 'a'.
't' after 'quo' is 'quot'.
'quot'+'a'='QUOTA'
Can you help me to learn more?
(Other definitions for quota that I've seen before include "Share, allowance" , "amount allowed" , "Proportional share" , "Import limitation" , "Apportionment" .)