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Rung here a number of times (6)

Ross

I believe the answer is:

ladder

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'rung here a' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'number of times' is the wordplay.
'number' becomes 'L' (L is an example).
'of times' becomes 'adder' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'adder'='LADDER'

Can you help me to learn more?

(Other definitions for ladder that I've seen before include "Unravel (as stocking)" , "A fire-fighter may use one" , "ranking table" , "Household climbing device or hole in stocking" , "Vertical run in tights" .)

I've seen this clue in the Sydney Morning Herald.
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