Rally for which there are about a hundred too many (7)
I believe the answer is:
recover
'rally for which there' is the definition.
'recover' can be an answer for 'rally' (rally can mean to recover from illness). I am not certain of the rest of the definition.
'about a hundred too many' is the wordplay.
'about' becomes 're' (regarding).
'a hundred' becomes 'C' (Roman numerals).
'too many' becomes 'over' (I've seen this in other clues).
're'+'c'+'over'='RECOVER'
'are' acts as a link.
Can you help me to learn more?
(Other definitions for recover that I've seen before include "Recuperate" , "Rescue" , "comeback" , "Regain" , "Bring back" .)