Crossword Genius

Essential equipment for invaders from Mars (4)

Ross

I believe the answer is:

arms

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

'essential equipment' is the definition.
'arms' can be an answer for 'equipment' (I have seen 'military equipment' mean 'arms' so perhaps 'equipment' could also mean 'arms'). I am not sure about the 'essential' bit.

'invaders from mars' is the wordplay.
'mars' anagrams to 'ARMS'.
But, I am not clear how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for arms that I've seen before include "Guns et cetera" , "pacifists won't take up" , "Protesting violently, up in these" , "Weapons and limbs" , "Crest - guns" .)

I've seen this clue in The Globe and Mail.
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