A lot of large amphibians having temperature taken (5)

I believe the answer is:

loads

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'a lot of' is the definition.
(I've seen this before)

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

(Other definitions for loads that I've seen before include "things to be carried" , "a lot" , "Burdens, cargoes" , "Oodles (informal)" , "Cargoes; lots" .)

I've seen this clue in The Independent.

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