Crossword Genius

Barker to misbehave, brought into line (7)

Ross

I believe the answer is:

terrier

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

I don't understand the remainder of the clue.

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(Other definitions for terrier that I've seen before include "Reserve soldier" , "Small, short-bodied dog" , "he's not a boxer" , "Dog - old land register" , "part-timer in Services" .)

I've seen this clue in The Sun.
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