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In The Zoo, part of the back door is missing second lock and the odd stall? (6)

Ross

I believe the answer is:

dorsal

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'in the zoo part of the back door' is the definition.
I can't tell whether this defines the answer.

'missing second lock and the odd stall?' is the wordplay.
'missing second lock' becomes 'dor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'the odd' indicates alternate letters.
The alternating letters of 'stall' are 'sal'.
'dor'+'sal'='DORSAL'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for dorsal that I've seen before include "Kind of fin" , "On the upper back" , "(Of fin) on upper side" , "'On the back, a fin on a fish perhaps (6)'" , "On the back, fin on a fish say" .)

I've seen this clue in The Irish Times.
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