Ignores princess's email sign-off (10)
I believe the answer is:
disregards
'ignores' is the definition.
('disregard' can be a synonym of 'ignore')
'princess's email sign-off' is the wordplay.
I cannot quite see how this works, but
'princess's' could be 'dis' (Princess Diana) and 'dis' is located in the answer.
The remaining letters 'regards' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for disregards that I've seen before include "skips" , "Shows no interest in" .)