Ring that woman about tearful leader (10)
I believe the answer is:
bellwether
'leader' is the definition.
(I know that bellwether is a type of leader)
'ring that woman about tearful' is the wordplay.
'ring' becomes 'bell' (both can mean to call on the phone).
'that woman' becomes 'W' (abbreviation eg in Woman Police Constable).
'about tearful' becomes 'ether' (I am not sure about this - if you are sure you should believe this answer much more).
'bell'+'w'+'ether'='BELLWETHER'
Can you help me to learn more?
(Other definitions for bellwether that I've seen before include "Leader of the flock" , "Leading sheep; trendsetter" , "Leading sheep of a flock" , "Sheep that leads the flock -- we tell Herb (anag)" .)