I'm unsure after bungling count in sequence (9)

I believe the answer is:

continuum

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

'sequence' is the definition.
(I have seen 'Uninterrupted sequence ' mean 'continuum' so perhaps 'sequence' could also mean 'continuum')

'i'm unsure after bungling count in' is the wordplay.
'i'm unsure' becomes 'um' (I can't justify this - if you can you should believe this answer much more).
'after' means one lot of letters go next to another.
'bungling' indicates an anagram (I've seen this in other clues).
'count'+'in'='countin'
'countin' with letters rearranged gives 'continu'.
'um' put after 'continu' is 'CONTINUUM'.

Can you help me to learn more?

(Other definitions for continuum that I've seen before include "Uninterrupted sequence" , "Unbroken series of indistinguishable parts" .)

I've seen this clue in The Telegraph.

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