Old African lake included in many a safari (5)

I believe the answer is:

nyasa

I'm a little stuck... Click here to teach me more about this clue!

'old african lake' is the definition.
'nyasa' can be an answer for 'lake' (I've seen this before). I am unsure of the 'old african' bit.

'included in many a safari' is the wordplay.
'included in' indicates a hidden word.
'NYASA' is hidden in the letters of 'many a safari'.

Can you help me to learn more?

(Other definitions for nyasa that I've seen before include "Malawi, formerly" , "lake in Africa" , "US city as a" , "Former name of Lake Malawi" .)

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

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