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Fluid, for example, drained from phlegmy liquid (5)

Ross

I believe the answer is:

lymph

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'fluid' is the definition.
(I know that lymph is a fluid)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lymph that I've seen before include "Bodily fluid" , "discharge through wounds" , "Colourless fluid with white blood cells" , "Fluid associated with a gland" , "Body fluid" .)

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