Long stretch (3)
'long stretch' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eon that I've seen before include "Long period of time" , "plenty of time" , "Vast age (alt. sp.)" , "billion years" , "Very long period (US and technical spelling)" .)
'long stretch' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aeon that I've seen before include "Epoch" , "An age; period" , "Very long and indefinite period of time" , "A very long time, an age" , "Eternity" .)