Crossword Genius

Moving while I cannot move I am hemmed in

Ross

I think it could be either:

Which length description are you looking for?:

2,6

8*

in action

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'i am hemmed in' is the definition.
I can't judge whether this defines the answer.

'moving while i cannot move' is the wordplay.
'moving while' becomes 'i' (I can't explain this - if you can you should believe this answer much more).
'move' indicates an anagram.
'i'+'cannot'='icannot'
'icannot' anagrammed gives 'naction'.
'i'+'naction'='IN ACTION'

Can you help me to learn more?

(Another definition for in action that I've seen is " Doing something".)

I've seen this clue in the Evening Standard.
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