Crossword Genius

Trained in secret as underground opposition (10)

Ross

I believe the answer is:

resistance

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'underground opposition' is the definition.
'resistance' can be an answer for 'opposition' (synonyms). I am unsure of the 'underground' bit.

'trained in secret as' is the wordplay.
'trained' indicates anagramming the letters (to train can mean to grow something into a shape).
'in'+'secret'+'as'='insecretas'
'insecretas' with letters rearranged gives 'RESISTANCE'.

Can you help me to learn more?

(Other definitions for resistance that I've seen before include "Organised covert opposition to an occupying power" , "Rebellious group" , "defiance" , "underground movement" , "Rebels" .)

I've seen this clue in The Guardian.
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