Approve of Red Nose fooling (7)
I believe the answer is:
endorse
'approve of' is the definition.
(I've seen this in another clue)
'red nose fooling' is the wordplay.
'fooling' indicates an anagram (I've seen 'fools' mean this (I've seen this in other clues)).
'red'+'nose'='rednose'
'rednose' with letters rearranged gives 'ENDORSE'.
(Other definitions for endorse that I've seen before include "Pass" , "Back, support" , "Red ones (anag.)" , "Give support or approval to" , "Rubber-stamp" .)