Tip (4)
'tip' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for apex that I've seen before include "white collar union" , "Absolute peak" , "Top point" , "Uppermost tip" , "crown" .)
'tip' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for upend that I've seen before include "Trip" , "change things drastically" , "Tip right over" , "Tip on side" , "Affect drastically" .)
'tip' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for wrinkle that I've seen before include "Device" , "clever innovation" , "Line (in flesh)" , "Depression in the smoothness of a surface, skin perhaps" , "Age line" .)