Crossword Genius

Exceedingly wily, imprisoning rebellious soldiers, … (9)

Ross

I believe the answer is:

supremely

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'exceedingly' is the definition.
(thesaurus)

'wily imprisoning rebellious soldiers' is the wordplay.
'wily' becomes 'sly' (synonyms).
'imprisoning' means one lot of letters goes inside another.
'rebellious' becomes 'up' (I can't explain this - if you can you should give a lot more credence to this answer).
'soldiers' becomes 'REME' (Royal Electrical and Mechanical Engineers).
'up'+'reme'='upreme'
'sly' placed around 'upreme' is 'SUPREMELY'.

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I've seen this clue in The Independent.
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