Like a bad waiter’s tip I meant to revise (9)

I believe the answer is:

impatient

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

'like a bad waiter's' is the definition.
I can't tell whether this defines the answer.

'tip i meant to revise' is the wordplay.
'to revise' indicates anagramming the letters.
'tip'+'i'+'meant'='tipimeant'
'tipimeant' with letters rearranged gives 'IMPATIENT'.

Can you help me to learn more?

(Other definitions for impatient that I've seen before include "Agitated" , "Irritable" , "Restless or short of temper" , "appeared anxious" , "dying" .)

I've seen this clue in The Times.

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