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Wine left by railway for old soldiers (7)

Ross

I believe the answer is:

cavalry

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

'for old soldiers' is the definition.
I can't tell whether this definition defines the answer.

'wine left by railway' is the wordplay.
'wine' becomes 'cava' (type of Spanish wine).
'left by' becomes 'l' (I've seen this in other clues).
'railway' becomes 'ry' (abbreviation).
'cava'+'l'+'ry'='CAVALRY'

Can you help me to learn more?

(Other definitions for cavalry that I've seen before include "Horse-soldiers" , "Horse soldiers" , "Soldiers on horseback" , "Mounted soldiers" , "Mounted troops" .)

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