New lemonade prepared for a seamstress (11)
I believe the answer is:
needlewoman
'for a seamstress' is the definition.
('needlewoman' can be a synonym of 'seamstress')
'new lemonade prepared' is the wordplay.
'prepared' indicates anagramming the letters.
'new'+'lemonade'='newlemonade'
'newlemonade' is an anagram of 'NEEDLEWOMAN'.
(Other definitions for needlewoman that I've seen before include "Seamstress" , "sewer" .)