Wolf chewed stuff up, with observer standing around (7)

I believe the answer is:

seducer

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

'wolf' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for seducer that I've seen before include "One leading sexually astray" , "One who takes advantage of the opposite sex" , "Rescued by sexual tempter" , "Philanderer" , "Rake" .)

I've seen this clue in The Times.

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