Crossword Genius

Shakespearean pledged something of interest in speech (5)

Ross

I believe the answer is:

fined

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'shakespearean' is the definition.
Although both the answer and definition are adjectives, I cannot see how one could define the other.

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

Can you help me to learn more?

(Other definitions for fined that I've seen before include "Fed in (anag.)" , "Mulcted" , "Ordered to pay penalty" , "Imposed financial penalty on" .)

I've seen this clue in The Times and The Sunday Times.
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