She gets Tina's back up with an article! (5)
I believe the answer is:
anita
'she' is the definition.
'tina's back up with an article' is the wordplay.
'back up' is a reversal indicator (I've seen 'backing up' mean this).
'with' means one lot of letters go next to another.
'an article' becomes 'a' (indefinite article).
'tina' in reverse letter order is 'anit'.
'anit'+'a'='ANITA'
'gets' is the link.
(Other definitions for anita that I've seen before include "Female" , "eg Dobson or Roddick" , "girl produced" , "- Loos (Gentlemen Prefer Blondes)" , "Woman" .)