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Creature’s responsibility, primarily: bridging tax (5)

Ross

I believe the answer is:

troll

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'creature's' is the definition.

I don't understand how the remainder of the clue works.

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(Other definitions for troll that I've seen before include "Folklore monster" , "Dwarfish creature" , "Online annoyance" , "Fish with a moving bait" , "Malignant elf" .)

I've seen this clue in The Hindu.
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