Rector streaked outside? Was curious to know more (5)

I believe the answer is:

pried

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'more' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs can sometimes define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pried that I've seen before include "acted inquisitively" , "Made intrusive enquiries" , "Speaking of sin" , "became inquisitive" , "Snooped" .)

I've seen this clue in The Independent.

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