Are out to attack (6)

I believe the answer is:

strike

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

'to attack' is the definition.
(I know that assail is a is a more specific form of the action of strike)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for strike that I've seen before include "Walk out" , "Form of industrial action" , "Hit - miss (in baseball)" , "Hit out in industrial dispute" , "Hit at a trade dispute" .)

I've seen this clue in the Evening Standard.

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