Reproduce flightless bird, extinct? (7)
I believe the answer is:
emulate
'reproduce' is the definition.
(I've seen this before)
'flightless bird extinct?' is the wordplay.
'flightless bird' becomes 'emu' (emu is a kind of flightless bird).
'extinct?' becomes 'late' (both can mean dead).
'emu'+'late'='EMULATE'
(Other definitions for emulate that I've seen before include "Match by imitation" , "Imitate - rival" , "Try to do as well as, follow example" , "Strive to equal or match" , "Mimic" .)