An insect's metamorphosis is going on continuously (9)
I believe the answer is:
incessant
'going on continuously' is the definition.
I can't tell whether this defines the answer.
'an insect's metamorphosis' is the wordplay.
'metamorphosis' indicates anagramming the letters.
'an'+'insects'='aninsects'
'aninsects' with letters rearranged gives 'INCESSANT'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for incessant that I've seen before include "Continuous" , "Nine casts (anag) - nonstop" , "Endless" , "Since Stan was continual." , "Instances being continually repeated" .)