Single parliamentarian, regrettably, seen cavorting in Africa (7)

I believe the answer is:

impalas

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'cavorting in africa' is the definition.
I can't judge whether this definition defines the answer.

'single parliamentarian regrettably' is the wordplay.
'single' becomes 'I' (one).
'parliamentarian' becomes 'MP' (Member of Parliament).
'regrettably' becomes 'alas' ('alas' is said before regrettable information).
'i'+'mp'+'alas'='IMPALAS'

'seen' acts as a link.

Can you help me to learn more?

(Other definitions for impalas that I've seen before include "African antelope with ridged curved horns" , "African runners" , "big game" , "Animals hunted by African" , "Animals jumping up" .)

I've seen this clue in The Irish Times.

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