Mimic large bird - teal, perhaps (7)
I believe the answer is:
emulate
'mimic' is the definition.
(to emulate is to copy or imitate)
'large bird teal perhaps' is the wordplay.
'large bird' becomes 'emu' (I've seen this before).
'perhaps' is an anagram indicator.
'teal' with letters rearranged gives 'late'.
'emu'+'late'='EMULATE'
(Other definitions for emulate that I've seen before include "Try to be equal or better than" , "Model oneself on" , "Try to equal by imitation" , "Try to equal (object of admiration)" , "Strive to equal or better" .)