Covering between 100 and 1000 substantial cycles (9)
I believe the answer is:
clingfilm
'substantial cycles' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'covering between 100 and 1000' is the wordplay.
I cannot quite understand how this works, but
'100' could be 'c' (Roman numeral) and 'c' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'1000' could be 'm' (roman numeral) and 'm' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for clingfilm that I've seen before include "Thin transparent plastic wrap" , "Sticky wrapper" , "Thin polythene for wrapping food etc" , "Thin plastic wrap for food" , "Plastic wrapping" .)