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Meet cider order, to an extent (9)

Ross

I believe the answer is:

decimetre

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'an extent' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'meet cider order' is the wordplay.
'order' indicates anagramming the letters.
'meet'+'cider'='meetcider'
'meetcider' anagrammed gives 'DECIMETRE'.

'to' is the link.

Can you help me to learn more?

(Another definition for decimetre that I've seen is " length".)

I've seen this clue in The Daily Express.
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