An insect's fluttering without pause (9)
I believe the answer is:
incessant
'an insect's fluttering without pause' is the definition.
I can't tell whether this defines the answer.
'an insect's fluttering without' is the wordplay.
'fluttering' indicates anagramming the letters.
'without' indicates putting letters inside.
'insects' is an anagram of 'incesst'.
'an' going within 'incesst' is 'INCESSANT'.
Can you help me to learn more?
(Other definitions for incessant that I've seen before include "Never-ending" , "Nine casts (anag) - nonstop" , "Endless" , "happening all the time" , "Instances (anag)" .)