At the end of one's tether, there's always a woman (3)
I believe the answer is:
her
'a woman' is the definition.
(her refers to a woman)
'at the end of one's tether there's always' is the wordplay.
'at' is a charade indicator (letters next to each other).
'the end of' suggests the final letters.
'there's always' becomes 'h' (I can't explain this - if you can you should believe this answer much more).
The last letters of 'one tether' are 'er'.
'er' put after 'h' is 'HER'.
Can you help me to learn more?
(Other definitions for her that I've seen before include "Belonging to a female" , "In the Midlands she" , "That lady" , "Belonging to the woman" , "That lady's" .)