Crossword Genius

Highly offensive action? (3-6)

Ross

I believe the answer is:

air-strike

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

'highly offensive' is the definition.
'air strike' can be an answer for 'offensive' (I know that air strike is a type of offensive). I am unsure of the 'highly' bit.

'action?' is the wordplay.
I cannot quite see how this works, but
'action?' could be 'strike' (strike is a kind of action) and 'strike' is found in the answer.
The remaining letters 'air' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for air-strike that I've seen before include "Attack by planes" , "Bombing attack" , "Aerial attack" , "Warplane attack" .)

I've seen this clue in The Sun.
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