Most dry grain's bagged by weight (6)

I believe the answer is:

wryest

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'most dry' is the definition.
Both the answer and definition are superlative adjectives. Maybe you can see an association between them that I can't see?

'grain's bagged by weight' is the wordplay.
'grain's' becomes 'rye's' (rye is a kind of grain).
'bagged by' indicates putting letters inside.
'weight' becomes 'wt'.
'ryes' placed within 'wt' is 'WRYEST'.

Can you help me to learn more?

(Another definition for wryest that I've seen is " dry in the extreme".)

I've seen this clue in The Telegraph.

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