Crossword Genius

As an old hand, reverse-called on a semiconductor device (7)

Ross

I believe the answer is:

gnarled

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'as an old hand' is the definition.
I can't judge whether this definition defines the answer.

'reverse-called on a semiconductor device' is the wordplay.
'reverse' says the letters should be written backwards.
'called' becomes 'rang' ('ring' can be a synonym of 'call'**).
'on' is a charade indicator (letters next to each other).
'a semiconductor device' becomes 'led' (LED is an example).
'rang' reversed gives 'gnar'.
'gnar'+'led'='GNARLED'

Can you help me to learn more?

(Other definitions for gnarled that I've seen before include "Knobbly and twisted (of wood)" , "Knotty" , "Rugged" , "Knotted, twisted (tree)" , "Old, twisted, and weathered" .)

I've seen this clue in The Guardian.
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