Refuse to accept princess with unhealthy complexion (8)
I believe the answer is:
disallow
'refuse to accept' is the definition.
(I've seen this before)
'princess with unhealthy complexion' is the wordplay.
'princess' becomes 'di' (Princess Diana).
'with' means one lot of letters go next to another.
'unhealthy complexion' becomes 'sallow' (I have seen 'Sickly complexion ' mean 'sallow' so perhaps 'complexion' could also mean 'sallow'. I am not sure about the 'unhealthy' bit.).
'di'+'sallow'='DISALLOW'
Can you help me to learn more?
(Other definitions for disallow that I've seen before include "Rule out" , "refuse permission" , "Refuse to accept as valid, as judge might a claim" , "bar" , "Reject" .)