Soldier preferred defensive feature (7)

I believe the answer is:

parapet

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'defensive feature' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'soldier preferred' is the wordplay.
'soldier' becomes 'para' (paratrooper).
'preferred' becomes 'pet' (synonyms).
'para'+'pet'='PARAPET'

Can you help me to learn more?

(Other definitions for parapet that I've seen before include "Rooftop wall" , "form of protection" , "Defensive line" , "Wall at roof's edge" , "Protective cover" .)

I've seen this clue in The Sun.

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