Such work is speculative (5)

I believe the answer is:

guess

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

'such work' is the definition.
'guess' can be an answer for 'work' (guessing is a kind of working). I am not sure about the 'such' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for guess that I've seen before include "Divine - estimate" , "Hypothesis" , "Estimate roughly" , "Fancy" , "the Americans believe it" .)

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

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