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So carelessly written, to revise play script, wasting time (9)

Ross

I believe the answer is:

scrappily

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'so carelessly written to' is the definition.
I can't tell whether this definition defines the answer.

'revise play script wasting time' is the wordplay.
'revise' is an anagram indicator.
'wasting' indicates named letters should be taken away.
'time' becomes 't' (abbreviation).
'play'+'script'='playscript'
'playscript' with 't' removed is 'playscrip'.
'playscrip' with letters rearranged gives 'SCRAPPILY'.

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I've seen this clue in The Times.
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