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A divinely expressed wish (8)

Ross

I believe the answer is:

godspeed

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'a divinely expressed wish' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

This is the entire clue.

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(Other definitions for godspeed that I've seen before include "Blessing or good wishes to traveller" , "parting statement" , "Word on parting" , "Farewell wish" , "Expression of good wishes to one starting a journey" .)

I've seen this clue in The Globe and Mail.
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