Big energy rises possible to apprehend (8)

I believe the answer is:

seizable

I'm a little stuck... Click here to teach me more about this clue!

'rises possible to apprehend' is the definition.
I can't judge whether this defines the answer.

'big energy' is the wordplay.
I cannot quite understand how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is present in the answer.
'big' could be 'sizable' (similar in meaning) and 'sizable' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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