Shaking in perfect remorse (6)

I believe the answer is:

tremor

'shaking' is the definition.
('tremor' can be a synonym of 'shaking')

'in perfect remorse' is the wordplay.
'in' indicates a hidden word.
'TREMOR' is hidden in the letters of 'perfect remorse'.

(Other definitions for tremor that I've seen before include "Shiver in the earth" , "Bit of excitement" , "A slight shake, perhaps of earth" , "feeling of excitement" , "Minor quake" .)

I've seen this clue in The Telegraph.

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