Crossword Genius

Triangular part of a model tank (5)

Ross

I believe the answer is:

delta

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'triangular part' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of a model tank' is the wordplay.
'of' indicates the answer is hidden within the clue.
'DELTA' is hidden in the letters of 'model tank'.

Can you help me to learn more?

(Other definitions for delta that I've seen before include "Greek character" , "Fragmented estuary" , "Fourth Greek letter? - area at river mouth" , "Type of wing" , "Eg, outlet of the Nile" .)

I've seen this clue in the Evening Standard.
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