A thousand and one tunes packed into less than an hour! (7)
I believe the answer is:
minutes
'a thousand' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'one tunes packed into less than an hour' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
an anagram of 'tunes' is 'nutes' which is located in the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for minutes that I've seen before include "Record of a meeting" , "Record of a meeting's decisions" , "summary" , "Recorded notes of a meeting" , "Records" .)