Observe ghost, about to move to the front (7)
I believe the answer is:
respect
'observe' is the definition.
('respect' can be a synonym of 'observe')
'ghost about to move to the front' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' (regarding) and 're' is found within the answer.
This explanation may well be incorrect...
(Other definitions for respect that I've seen before include "estimation" , "Deference, obedience" , "Show honour to" , "Have high regard for sceptre" , "Show deference (to)" .)