Liquid runs — it's the worst consistency? (15)

I believe the answer is:

trustworthiness

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

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

'liquid runs it's the worst' is the wordplay.
'liquid' indicates anagramming the letters.
'runs'+'its'+'the'+'worst'='runsitstheworst'
'runsitstheworst' is an anagram of 'TRUSTWORTHINESS'.

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.

Want a hint initially instead of a full solution? Install my app