State "Queen's child with German grandparent, ultimately, can be fighter in war" (13)

I believe the answer is:

messerschmitt

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'be fighter in war' is the definition.
The definition suggests a singular noun which matches the answer.

'state queen's child with german grandparent ultimately' is the wordplay.
'state' becomes 'mess' (in a state means in a mess).
'queen's' becomes 'ers' (abbreviation for Elizabeth Regina).
'child' becomes 'ch' (abbreviation for child).
'with german' becomes 'mit' ('with' in German).
'ultimately' says to take the final letters.
The last letter of 'grandparent' is 't'.
'mess'+'ers'+'ch'+'mit'+'t'='MESSERSCHMITT'

'can' is the link.

Can you help me to learn more?

(Other definitions for messerschmitt that I've seen before include "German aeroplane make" , "German World War Two aircraft" .)

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