Red activists get organised — that shows lots of guts! (9,6)
I believe the answer is:
digestive tracts
'lots of guts' is the definition.
'red activists get organised' is the wordplay.
'organised' is an anagram indicator.
'red'+'activists'+'get'='redactivistsget'
'redactivistsget' anagrammed gives 'DIGESTIVE TRACTS'.
'that shows' is the link.
I've seen this clue in The Guardian.
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