Hastily wrote long passage, making a drug into something that might be boring (8)

I believe the answer is:

scrawled

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'hastily wrote' is the definition.
'scrawled' can be an answer for 'wrote' (scrawling is a kind of writing). I'm unsure of the 'hastily' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scrawled that I've seen before include "Wrote carelessly in bad handwriting" , "Wrote carelessly with red claws" .)

I've seen this clue in The Guardian.

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