Devices gyrated wildly under the force of gravity (8)
I believe the answer is:
gadgetry
'devices' is the definition.
(I have seen 'ingenious devices' mean 'gadgetry' so perhaps 'devices' could also mean 'gadgetry')
'gyrated wildly under the force of gravity' is the wordplay.
'wildly' indicates an anagram.
'under' says to put letters next to each other.
'the force of gravity' becomes 'g' (I've seen this in other clues).
'gyrated' with letters rearranged gives 'adgetry'.
'adgetry' put after 'g' is 'GADGETRY'.
(Other definitions for gadgetry that I've seen before include "Small ingenious devices in general" , "gismos" , "Mechanical tools" , "The making of small ingenious devices" .)