Turns up Old Nick consumes Oriental starters of Eggs Benedict? Thought so! (8)

I believe the answer is:

believed

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'thought so' is the definition.
'believed' can be an answer for 'thought' ('believe' can be a synonym of 'think'). I'm not certain of the 'so' bit.

'turns up old nick consumes oriental starters of eggs benedict?' is the wordplay.
'turns up' says the letters should be written backwards.
'old nick' becomes 'devil' ('Devil' can be a synonym of 'old nick').
'consumes' means one lot of letters goes inside another.
'oriental' becomes 'e'.
'starters of' indicates taking the first letters.
The initial letters of 'eggs benedict' is 'eb'.
'devil' enclosing 'e' is 'deveil'.
'deveil'+'eb'='deveileb'
'deveileb' in reverse letter order is 'BELIEVED'.

Can you help me to learn more?

(Other definitions for believed that I've seen before include "Accepted as true" , "Credited" , "Thought" , "Regarded as true" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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