Woman possibly read ultimatum, but not from start to finish (5)

I believe the answer is:
adult
'woman' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'read ultimatum but not from start to finish' is the wordplay.
'ADULT' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for adult that I've seen before include "No child" , "Mature, fully grown" , "One no longer young" , "not fit for children to see" , "Indecent" .)
