Crossword Genius

Senior general wrong to capture unknown soldiers (5,9)

Ross

I believe the answer is:

royal engineers

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

'soldiers' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

'senior general wrong to capture unknown' is the wordplay.
'wrong' indicates an anagram.
'to capture' is an insertion indicator.
'unknown' becomes 'y' (algebra).
'senior'+'general'='seniorgeneral'
'seniorgeneral' anagrammed gives 'roalengineers'.
'roalengineers' enclosing 'y' is 'ROYAL ENGINEERS'.

Can you help me to learn more?

(Other definitions for royal engineers that I've seen before include "Technical corps" , "British Army Corps" , "Losing side in first FA cup final" .)

I've seen this clue in The Sunday Times.
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