Insect, one of ten on the wall? (11)

'insect' is the definition.
(greenbottle is a kind of insect)

'one of ten on the wall?' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' 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?