Book describing shyness (7)

I believe the answer is:

reserve

This clue is a double definition.

'book' is the first definition.
(as in booking or reserving in advance)

'shyness' is the second definition.

'describing' acts as a link.

(Other definitions for reserve that I've seen before include "Husband - substitute" , "put to one side" , "Set aside - shyness" , "8 [RESTRAINT]" , "Keep for future use" .)

I've seen this clue in The Globe and Mail.

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