Charges into wool-growers (4)

I believe the answer is:

rams

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'charges' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rams that I've seen before include "Batters like male sheep?" , "Hits; sheep" , "Bangs into as car might" , "drives" .)

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

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