Crossword Genius

Endlessly lie over runs on Irish bank (9)

Ross

I believe the answer is:

reservoir

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

'endlessly lie' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'runs on irish bank' is the wordplay.
'runs' becomes 'servo' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' becomes 're' ('on' can be mean 'with reference to').
'irish' becomes 'IR' (abbreviation).
'bank' means one lot of letters goes inside another (outside letters create limits or banks).
're'+'ir'='reir'
'servo' inserted within 'reir' is 'RESERVOIR'.

'over' acts as a link.

Can you help me to learn more?

(Other definitions for reservoir that I've seen before include "Artificial lake" , "depot" , "Store for water etc" , "Man-made lake of stored water" , "Man-made lake to store water" .)

I've seen this clue in The Telegraph.
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