Complains aloud of strained sinew — it's the booze! (5)
I believe the answer is:
wines
'the booze' is the definition.
'complains aloud of strained sinew' is the wordplay.
'sinew' anagrams to 'WINES'.
However, I'm unsure how the anagram is indicated.
'it's' is the link.
I've seen this clue in The Guardian.
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