Dismiss from consideration (4,3)
I believe the answer is:
rule out
'dismiss from consideration' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rule out that I've seen before include "discount" , "Exclude as a possibility" , "Eliminate from consideration - using drawing stick?" , "Exclude as irrelevant or inadmissible" , "Eliminate, exclude as irrelevant" .)