Crossword Genius

Swore regularly, harbouring anger for snarer of animals (5)

Ross

I believe the answer is:

wirer

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'snarer of animals' is the definition.
The definition suggests a singular noun which matches the answer.

'swore regularly harbouring anger' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'harbouring' is an insertion indicator.
'anger' becomes 'ire' (ire is intense rage).
The alternating letters of 'swore' are 'wr'.
'wr' enclosing 'ire' is 'WIRER'.

'for' acts as a link.

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I've seen this clue in The Telegraph.
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