Right hand page of some directory (5)

I believe the answer is:

recto

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'right hand page' is the definition.
'recto' can be an answer for 'page' (right-hand page of an open book). I am not certain of the 'right hand' bit.

'some directory' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'RECTO' can be found hidden inside 'directory'.

'of' is the link.

Can you help me to learn more?

(Other definitions for recto that I've seen before include "right page" , "Right-hand pages of book" , "Right-hand page of an open book" , "front page" , "one side" .)

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

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