Part of the body whose technical name is the pollex (5)

I believe the answer is:

thumb

(Other definitions for thumb that I've seen before include "Hitch-hiker's tool" , "One opposed to other manual workers" , "''Tom ..., the piper's son'' (nursery rhyme)" , "Pollex, in humans" , "Tom's digit" .)

I've seen this clue in The Independent.

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