Crossword Genius

They secure 150 snakes (6)

Ross

I believe the answer is:

clasps

'they secure' is the definition.
(clasps secure something in place)

'150 snakes' is the wordplay.
'150' becomes 'CL' (Roman numerals).
'snakes' becomes 'asps' (asp is a kind of snake).
'cl'+'asps'='CLASPS'

(Other definitions for clasps that I've seen before include "Holds the fastenings to one's bosom" , "Embraces; fastenings" , "Fasteners, as on necklaces perhaps" , "Holds tightly" , "Embraces, hugs" .)

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