Puts play off, its bill being remarkable (8)
I believe the answer is:
platypus
'its bill being remarkable' is the definition.
(as in a duck-billed platypus)
'puts play off' is the wordplay.
'off' indicates anagramming the letters.
'puts'+'play'='putsplay'
'putsplay' is an anagram of 'PLATYPUS'.
(Other definitions for platypus that I've seen before include "Australian mammal with duckbill" , "venomous mammal" , "Australian egg-producer" , "Australian mammal with large bill and webbed feet" , "Australian resident" .)