Crossword Genius

A promontory in the mouth of the river? (6,2,4)

Ross

I believe the answer is:

tongue of land

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

'river?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'a promontory in the mouth of' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

'the' acts as a link.

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