Elicit go-ahead somehow from rough-and-ready rehearsal (6)

I believe the answer is:

dryrun

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'elicit go-ahead somehow from rough-and-ready rehearsal' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'elicit go' is the wordplay.
'elicit' becomes 'dry' (I am not sure about this - if you are sure you should believe this answer much more).
'go' becomes 'run' (synonyms).
'dry'+'run'='DRYRUN'

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I've seen this clue in The Irish Times.

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