Personally, that's why I'm studying the script (3,2,4)

I believe the answer is:

for my part

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'personally' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for for my part that I've seen before include "Personally" , "As far as I'm concerned" .)

I've seen this clue in the Evening Standard.

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