Phrase uttered connoting keen approbation, primarily? (5)

I believe the answer is:

pucka

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'phrase uttered connoting keen approbation primarily?' is the definition.
I can't tell whether this defines the answer.

'phrase uttered connoting keen approbation primarily?' is the wordplay.
'primarily?' says to take the initial letters (I've seen 'primarily' mean this).
The first letters of 'phrase uttered connoting keen approbation' is 'PUCKA'.

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I've seen this clue in The Everyman puzzle in The Observer.

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