Water in Rome regularly runs extremely dry creating dilemma (8)

I believe the answer is:

quandary

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'dilemma' is the definition.
(I know that dilemma can be written as quandary)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for quandary that I've seen before include "Problem" , "State of uncertainty as to action to take" , "Dilemma, a state of perplexity" , "Predicament - dilemma - uncertainty" , "awkward situation" .)

I've seen this clue in The Irish Times.

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