Plough frames make capital investments (12)

I believe the answer is:

shareholders

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

'capital investments' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.

'plough frames make' is the wordplay.
I cannot really understand how this works, but
'make' could be 'hold' ('hold' can be a synonym of 'make') and 'hold' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

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

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