A leader in the blending of wines? (5)

I believe the answer is:

sinew

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'a leader in the blending' is the definition.
I can't tell whether this defines the answer.

'of wines?' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'wines' is an anagram of 'SINEW'.

Can you help me to learn more?

(Other definitions for sinew that I've seen before include "fibre" , "Cord of tissue connecting muscle to bone" , "Inelastic tissue" , "Strength; tendon" , "Tough material" .)

I've seen this clue in the Evening Standard.

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