Biologists initially shoot two under naturalist's ship (6)
I believe the answer is:
beagle
'naturalist's ship' is the definition.
'beagle' can be an answer for 'ship' (ship Charles Darwin travelled on). I'm unsure of the 'naturalist's' bit.
'biologists initially shoot two under' is the wordplay.
'initially' says to take the initial letters.
'shoot two under' becomes 'eagle' (I've seen this in another clue).
The initial letter of 'biologists' is 'b'.
'b'+'eagle'='BEAGLE'
Can you help me to learn more?
(Other definitions for beagle that I've seen before include "Small short-legged hound" , "Darwin voyaged in this ship" , "Breed of dog in a glebe" , "Short-haired dog" , "Hunting dog followed on foot" .)