Jenny Wren, perhaps, spotted insect (8)
I believe the answer is:
ladybird
'spotted insect' is the definition.
(insect with spots)
'jenny wren perhaps' is the wordplay.
'jenny' becomes 'lady' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wren perhaps' becomes 'bird' (wren is a kind of bird).
'lady'+'bird'='LADYBIRD'
Can you help me to learn more?
(Other definitions for ladybird that I've seen before include "Colourful beetle" , "Red insect with black spots" , "that's spotted in gardens" , "This insect likes greenfly" , "spotted crawler" .)