Crossword Genius

One receiving pay slip: ring line guaranteeing payment? (10)

Ross

I believe the answer is:

promissory

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

'one' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.

'receiving pay slip ring line guaranteeing payment?' is the wordplay.
I cannot quite understand how this works, but
'slip' could be 'miss' and 'miss' is present in the answer.
'ring' could be 'o' (letter resembling a ring) and 'o' is present in the answer.
'line' could be 'ry' (abbreviation for railway) and 'ry' is present in the answer.
The remaining letters 'pro' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for promissory that I've seen before include "upon my word, I could be made to pay!" , "Like an IOU" , "Giving assurance for the future" , "Containing pledge" .)

I've seen this clue in The Times.
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