Two measures introduced by a woman (5)
I believe the answer is:
ellen
'woman' is the definition.
(woman's name)
'two measures' is the wordplay.
'two measures' can mean two replacements for 'measure'.
'measure' becomes 'ell' (historical unit of length).
'measure' becomes 'en' (typographical measure).
'ell'+'en'='ELLEN'
'introduced by a' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ellen that I've seen before include "It could be Terry" , "Dame - MacArthur, round-the-world sailor" , "Dame - - Macarthur (naut.)" , "-- DeGeneres, US actress" , "the Lady of the Lake" .)