Jack (one of two) abandoned a shady nook (4,5)

I believe the answer is:

left bower

I'm a little stuck... Click here to teach me more about this clue!

'jack one of two' is the definition.
'left bower' can be an answer for 'jack' (thesaurus). I'm unsure of the 'one of two' bit.

'abandoned a shady nook' is the wordplay.
'abandoned' becomes 'left' (leave can mean to abandon).
'a shady nook' becomes 'bower' (I've seen this in another clue).
'left'+'bower'='LEFT BOWER'

Can you help me to learn more?

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

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