Coded text in tomb upset woman (10)
I believe the answer is:
cryptogram
'coded text' is the definition.
(I've seen this before)
'tomb upset woman' is the wordplay.
'tomb' becomes 'crypt' (crypt is a kind of tomb).
'upset' says the letters should be written in reverse.
'woman' becomes 'margo' (**).
'margo' back-to-front is 'ogram'.
'crypt'+'ogram'='CRYPTOGRAM'
'in' is the link.
(Other definitions for cryptogram that I've seen before include "Coded message" , "Coded text" , "PUZZLE" , "Piece of coded writing" .)