Designate for a purpose (5)
'designate for a purpose' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for earmark that I've seen before include "Allocate for a purpose" , "Reserve for later use" , "It identifies the outcome" , "Set aside for special purpose" , "Set aside for future use" .)
(Other definitions for allot that I've seen before include "Earmark" , "Apportion (something to someone)" , "Hand out" , "deal" , "grant" .)