A sensational success - in clearing obstructions? (11)

I believe the answer is:

blockbuster

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

'a sensational success' is the definition.
'blockbuster' can be an answer for 'success' (I have seen 'Commercial success ' mean 'blockbuster' so perhaps 'success' could also mean 'blockbuster'). I'm not sure about the 'a sensational' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for blockbuster that I've seen before include "Commercial success" , "best seller?" , "Landmine" , "Sort of film" , "Film or book making huge profits" .)

I've seen this clue in The Globe and Mail.

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