Though a natural for, is eliminated (3,3)
I believe the answer is:
cut out
'though a natural' is the definition.
I can't judge whether this defines the answer.
'for is eliminated' is the wordplay.
'for' becomes 'cut' (I can't explain this - if you can you should give a lot more credence to this answer).
'is eliminated' becomes 'out' (I've seen this in another clue).
'cut'+'out'='CUT-OUT'
Can you help me to learn more?
(Other definitions for cut out that I've seen before include "Stop" , "Excise" , "Automatic safety circuit-breaker" , "Cease operating" , "Cease to function, like car engine" .)