Crossword Genius

Reliability of management line about spare points (15)

Ross

I believe the answer is:

trustworthiness

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

'reliability' is the definition.
(I've seen this before)

'of management line about spare points' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'management' could be 'trust' (a trust manages or looks after something) and 'trust' is found within the answer.
'spare' could be 'thin' (similar in meaning) and 'thin' is present in the answer.
'about' could be 're' (regarding) and 're' is found within the remaining letters.
'points' could be 'ws' (W is an example) and 'ws' is found in the leftover letters.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for trustworthiness that I've seen is " Honesty, reliability".)

I've seen this clue in The Times.
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