Crossword Genius

Old SA president gets droid to make bombs (5)

Ross

I believe the answer is:

botha

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

'old sa president' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'droid to make bombs' is the wordplay.
I cannot really understand how this works, but
'droid' could be 'bot' (I've seen this in another clue) and 'bot' is present in the answer.
The remaining letters 'ha' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'gets' is the link.

Can you help me to learn more?

(Other definitions for botha that I've seen before include "former South African general" , "PM in Africa" .)

I've seen this clue in the Sydney Morning Herald.
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