Crossword Genius

Attack or invasion for less than a day (5)

Ross

I believe the answer is:

foray

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

'attack' is the definition.
(foray is a kind of attack)

'or invasion for less than a day' is the wordplay.
I cannot really understand how this works, but
'or' is within the answer.
'a' is within the answer.
The remaining letters 'fy' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for foray that I've seen before include "Raid into enemy territory" , "Brief attack" , "Assault" , "Raid for plunder" , ".A sudden attack or raid" .)

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