A carrot tops in the open beaks of parrots (6)
I believe the answer is:
macaws
'parrots' is the definition.
(macaw is a kind of parrot)
'a carrot tops in the open beaks' is the wordplay.
'tops' suggests taking the first letters.
'in' indicates putting letters inside.
'the open beaks' becomes 'maws' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letter of 'carrot' is 'c'.
'a'+'c'='ac'
'ac' placed within 'maws' is 'MACAWS'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for macaws that I've seen before include "Brightly-coloured parrots" , "More than one bird" , "Long-tailed, brilliantly-coloured parrots" , "Birds" , "Long-tailed parrots of Central and South America" .)