Turner includes a second sketch of the sail (9)

I believe the answer is:

spinnaker

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'sail' is the definition.
(I know that spinnaker is a type of headsail)

'turner includes a second sketch' is the wordplay.
'turner' becomes 'spinner' (I can't justify this - if you can you should believe this answer much more).
'includes' is an insertion indicator.
'second sketch' becomes 'k' (pnd letter of 'sketch').
'a'+'k'='ak'
'spinner' enclosing 'ak' is 'SPINNAKER'.

'of the' is the link.

Can you help me to learn more?

(Other definitions for spinnaker that I've seen before include "Large three-cornered sail" , "Type of sail" , "one using the breeze" , "Lightweight sail" , "Large triangular sail at the front of a yacht" .)

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

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