Sanction Diana, for one, bearing crosses (7)
I believe the answer is:
endorse
'sanction' is the definition.
(I know that endorse is a more specific form of the action sanction)
'diana for one bearing crosses' is the wordplay.
'diana for one' becomes 'Dors' (actress Diana Dors, e9ee-e984).
'bearing' becomes 'ene' (east by northeast compass bearing).
'crosses' indicates putting letters inside.
'dors' going inside 'ene' is 'ENDORSE'.
(Other definitions for endorse that I've seen before include "Give backing to" , "Red ones (anag.)" , "Corroborate" , "'Approve of, back (7)'" , "Express approval" .)