Crossword Genius

Strain mouth? (5)

Ross

I believe the answer is:

delta

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

This might be a double definition.

'strain' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'mouth?' is the second definition.
(I know that delta is a type of river mouth)

Can you help me to learn more?

(Other definitions for delta that I've seen before include "sort of wing" , "Type of wing" , "Code word for D" , "Alluvial river mouth" , "Letter - where river divides" .)

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