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I'd followed most of the seminar, it's a bit dry! (8)

Ross

I believe the answer is:

semiarid

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'i'd followed most of the seminar' is the definition.
I can't judge whether this definition defines the answer.

'a bit dry' is the wordplay.
'a bit' becomes 'semi' (I can't justify this - if you can you should believe this answer much more).
'dry' becomes 'arid' (similar in meaning).
'semi'+'arid'='SEMIARID'

'it's' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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