Sprayed mealy bug, dropping off, may stand out (5)
I believe the answer is:
bulge
'stand out' is the definition.
(thesaurus)
'sprayed mealy bug dropping off may' is the wordplay.
'sprayed' indicates an anagram (I've seen 'spraying' mean this).
'mealy bug' becomes 'mealybug' (synonyms).
'dropping off' suggests deleting specific letters.
'mealybug' with 'may' taken out is 'elbug'.
'elbug' is an anagram of 'BULGE'.
(Other definitions for bulge that I've seen before include "Protrusion" , "Hump" , "Rounded swelling" , "Swell" , "Hitler's offensive" .)