Crossword Genius

Spare let? You'll have to book (7)

Ross

I believe the answer is:

reserve

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This might be a double definition.

'spare let? you'll' is the first definition.
'reserve' can be an answer for 'spare' (I've seen this before). I am unsure of the 'let? you'll' bit.

'to book' is the second definition.
('reserve' can be a synonym of 'book')

'have' is the link.

Can you help me to learn more?

(Other definitions for reserve that I've seen before include "man on bench?" , "Conservation area" , "cool" , "One on bench" , "put to one side" .)

I've seen this clue in The Independent.
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