More than one stoppage makes a violent impact (7)

I believe the answer is:

strikes

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

'makes a violent impact' is the definition.
'strikes' can be an answer for 'makes' (striking is a kind of making). I'm not certain of the 'a violent impact' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for strikes that I've seen before include "Hits" , "Impresses" , "(Takes) industrial action" .)

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app