Scientist's that woman cross with dull routine (10)
I believe the answer is:
rutherford
'scientist's' is the definition.
(I've seen this before)
'woman cross with dull routine' is the wordplay.
'woman' becomes 'her' (her refers to a woman).
'cross' becomes 'ford' (to ford a river is to cross it).
'with' means one lot of letters go next to another.
'dull routine' becomes 'rut' (I've seen this before).
'her'+'ford'='herford'
'herford' after 'rut' is 'RUTHERFORD'.
'that' is the link.
(Other definitions for rutherford that I've seen before include "Scientist" , "Den" , "Actress" .)