Crossword Genius

Military sphere supposedly sending third of weapons to the front (4)

Ross

I believe the answer is:

mars

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

'the front' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'military sphere supposedly sending third of weapons' is the wordplay.
I cannot quite understand how this works, but
'third of weapons' could be 'a' (3rd letter of 'weapons') and 'a' is found in the answer.
The remaining letters 'mrs' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Other definitions for mars that I've seen before include "Famous Texas mission" , "classical god" , "Red planet and god of war" , "March to the French" , "War god - chocolate bar - spoils" .)

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