Analyses sentence levels established with no time to spare (6)
I believe the answer is:
parses
'analyses' is the definition.
(parsing is a kind of analysing)
'sentence levels established with no time to spare' is the wordplay.
I cannot quite see how this works, but
an anagram of 'spare' is 'parse' which is located in the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for parses that I've seen is " Analyses form and function of words in sentence".)