One woman in a dozen, I dare say (4)
I believe the answer is:
enid
'one woman' is the definition.
(woman's name)
'in a dozen i dare say' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ENID' is hidden in the letters of 'dozen i dare say'.
(Other definitions for enid that I've seen before include "Dine with this girl" , "& 18 Down Children's author" , "Miss Blyton" , "Geraint's loved one" , "Geraint's wife's" .)