Really trying to get the opposition dismissed (3,3)

I believe the answer is:

all out

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'really trying to get' is the definition.
I can't judge whether this definition defines the answer.

'opposition dismissed' is the wordplay.
'opposition' becomes 'all' (I can't explain this - if you can you should give a lot more credence to this answer).
'dismissed' becomes 'out' (dismissed in cricket).
'all'+'out'='ALL-OUT'

'the' is the link.

Can you help me to learn more?

(Other definitions for all out that I've seen before include "call for 6 [STRIKING]?" , "unable to bat on" , "Call for the strike" , "Complete" , "Determined" .)

I've seen this clue in the Evening Standard.

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