Several kinds of birds (6)
I believe the answer is:
divers
This could be a double definition.
'several' is the first definition.
(I've seen this before)
'kinds of birds' is the second definition.
'divers' can be an answer for 'birds' (diver is a kind of bird). I am not certain of the 'kinds of' bit.
Can you help me to learn more?
(Other definitions for divers that I've seen before include "people taking the plunge" , "Sundry - underwater explorers" , "seabirds" , "varying types from the past" , "Several; snorkellers" .)