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Dam lake, the one sisters look up to? (6,8)

Ross

I believe the answer is:

mother superior

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'one sisters look up to?' is the definition.
I can't judge whether this definition defines the answer.

'dam lake' is the wordplay.
'dam' becomes 'mother' (I've seen this before).
'lake' becomes 'superior' (I've seen this before).
'mother'+'superior'='MOTHER SUPERIOR'

'the' acts as a link.

Can you help me to learn more?

(Other definitions for mother superior that I've seen before include "leading nun" , "leader of religious community" , "First among sisters" , "head of religious community" .)

I've seen this clue in The Telegraph.
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