Crossword Genius

Opening out within the borders of Meath (5)

Ross

I believe the answer is:

mouth

'opening' is the definition.
(mouth is a kind of opening)

'out within the borders of meath' is the wordplay.
'within' means one lot of letters goes inside another.
'the borders of' says to hollow out the word (remove centre letters).
'meath' with its centre taken out is 'mh'.
'out' placed within 'mh' is 'MOUTH'.

(Other definitions for mouth that I've seen before include "Where a river enters the sea" , "River outlet" , "River part - conversation opener?" , "River ending" , "Opening of a bay" .)

I've seen this clue in the Evening Standard.
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