Staggered entries will finally join up again (2-6)

I believe the answer is:

re-enlist

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'join up again' is the definition.
I can't tell whether this definition defines the answer.

'staggered entries will finally' is the wordplay.
'staggered' indicates an anagram.
'finally' indicates one should take the final letters.
The final letter of 'will' is 'l'.
'entries'+'l'='entriesl'
'entriesl' with letters rearranged gives 'RE-ENLIST'.

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