A gap where canula bends (6)

I believe the answer is:

lacuna

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'a gap' is the definition.
(lacuna is a kind of gap)

'canula bends' is the wordplay.
'canula' can be anagrammed to 'LACUNA'.
Though, I am not clear how this is indicated.

'where' is the link.

Can you help me to learn more?

(Other definitions for lacuna that I've seen before include "A gap, or section missing from a book" , "Hiatus - cavity" , "something missing" , "A gap or missing segment as from book" , "Gap or hiatus" .)

I've seen this clue in The Independent.

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