Or ____! (4)
(Other definitions for pole that I've seen before include "Staff" , "Chopin, for example" , "This position is favourable in motor race" , "support" , "Heavenly body indicating north" .)
(Other definitions for else that I've seen before include "As an alternative" , "In addition, besides" , "In addition; different" , "Adverb meaning if not, otherwise" , "Eels (anag)" .)
(Other definitions for sign that I've seen before include "Pointer - indicate agreement in writing" , "Notice; symbol" , "Evidence" , "Public notice; Leo, say" , "Any of the 12 divisions of the Zodiac" .)
'or' is the definition.
This is the entire clue.
(Other definitions for alternatively that I've seen before include "On the other hand" , "Otherwise" , "as another option" .)
(Other definitions for symbol that I've seen before include "Emblem or sign" , "Non-verbal sign that has significance" , "Emblem, representation" , "Representative mark" , "Sign that stands for something" .)
(Other definitions for expletive that I've seen before include "Swearword" , "Swear word" , "oath" , "Dirty word" , "I expel vet with obscene exclamation" .)