Crossword Genius

Work to reinforce regular army policy (4)

Ross

I believe the answer is:

line

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

This clue is a quadruple definition!!

'work' is the first definition.
(line can mean someone's profession or work)

'to reinforce' is the second definition.
(lining is a kind of reinforcing)

'regular army' is the third definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'policy' is the fourth definition.
(as in the party line)

Can you help me to learn more?

(Other definitions for line that I've seen before include "dash one end to the other" , "Railway track; wrinkle" , "Phone connection; queue" , "An American queue" , "short note" .)

I've seen this clue in The Independent.
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