Luggage is found in the lowlands (7)

I believe the answer is:

valises

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'luggage is found in the lowlands' is the definition.
I can't tell whether this definition defines the answer.

'is found in the lowlands' is the wordplay.
'found in' is an insertion indicator.
'the lowlands' becomes 'vales' (I've seen this in another clue).
'is' inserted within 'vales' is 'VALISES'.

Can you help me to learn more?

(Another definition for valises that I've seen is " Overnight cases".)

I've seen this clue in The Irish Independent.

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