Last letter: has ducks. makes sense keeping animals (10)

I believe the answer is:

zoological

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'last letter has ducks makes sense keeping animals' is the definition.
I can't tell whether this defines the answer.

'last letter has ducks makes sense' is the wordplay.
'last letter' becomes 'z' (in the alphabet).
'has' says to put letters next to each other.
'ducks' becomes 'oo' (two O's - duck means zero in cricket).
'makes sense' becomes 'logical' (I can't justify this - if you can you should believe this answer much more).
'z'+'oo'+'logical'='ZOOLOGICAL'

Can you help me to learn more?

(Other definitions for zoological that I've seen before include "Relating to the study of animals" , "of garden of animals" .)

I've seen this clue in the Sydney Morning Herald.

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