Copy flightless bird no longer living (7)
I believe the answer is:
emulate
'copy' is the definition.
(I've seen this before)
'flightless bird no longer living' is the wordplay.
'flightless bird' becomes 'emu' (emu is a kind of flightless bird).
'no longer living' becomes 'late' (I can't explain this - if you can you should give a lot more credence to this answer).
'emu'+'late'='EMULATE'
Can you help me to learn more?
(Other definitions for emulate that I've seen before include "Copy - rival" , "Strive to equal or better" , "Copy; try to equal" , "Try to be like" , "Strive to equal or match" .)