Crossword Genius

A knob in drawer, currently? (5)

Ross

I believe the answer is:

anode

I'm a little stuck... Click here to teach me more about this clue!

'drawer currently?' is the definition.
I can't judge whether this defines the answer.

'a knob' is the wordplay.
'knob' becomes 'node' (I've seen this in another clue).
'a'+'node'='ANODE'

'in' is the link.

Can you help me to learn more?

(Other definitions for anode that I've seen before include "Electrical terminal" , "Opposite to cathode" , "Electrical pole" , "Positive connection" , "that comes out of a cell?" .)

I've seen this clue in The Guardian.
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