Turn over page covered by nude spread (5)
I believe the answer is:
upend
'turn over' is the definition.
(I've seen this before)
'page covered by nude spread' is the wordplay.
'page' becomes 'p'.
'covered by' means one lot of letters goes inside another.
'spread' indicates anagramming the letters.
'nude' anagrammed gives 'uend'.
'p' inserted inside 'uend' is 'UPEND'.
(Other definitions for upend that I've seen before include "Overturn" , "Make a turnover" , "Affect greatly" , "Tip right over" , "Tip on side" .)