Crossword Genius

Line brought into use when one rings (4,4)

Ross

I believe the answer is:

bell rope

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'one rings' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'line brought into use' is the wordplay.
'line' becomes 'bell' (bell is a kind of line).
'brought into use' becomes 'rope' (I can't justify this - if you can you should give a lot more credence to this answer).
'bell'+'rope'='BELL-ROPE'

'when' is the link.

Can you help me to learn more?

(Other definitions for bell rope that I've seen before include "line to carry out changes?" , "It hangs in the tower" .)

I've seen this clue in The Globe and Mail.
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