Pocket set ordered with neat rulers (10)

I believe the answer is:

potentates

'rulers' is the definition.
(potentate is a kind of ruler)

'pocket set ordered with neat' is the wordplay.
'pocket' becomes 'pot' (as in to pot or pocket a ball in snooker).
'ordered with' is an anagram indicator.
'set' with its letters anagrammed with 'neat' can make 'entates'.
'pot'+'entates'='POTENTATES'

I've seen this clue in The Telegraph.

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