Mange to undo long gate (8)

I believe the answer is:

getalong

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'mange' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'undo long gate' is the wordplay.
'undo' indicates an anagram (I've seen 'undoing' mean this).
'long'+'gate'='longgate'
'longgate' with letters rearranged gives 'GETALONG'.

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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