Crossword Genius

As army recruits would do once, getting royally rewarded? (4,3,5,8)

Ross

I believe the answer is:

take the kings shilling

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

'royally rewarded?' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally mean the same thing.

'as army recruits would do once' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is found in the answer.
'army' could be 'ta' (abbreviation for Territorial Army) and 'ta' is found within the answer.
This explanation may well be incorrect...

'getting' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.
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