Crossword Genius

Firmly hold 150 snakes (6)

Ross

I believe the answer is:

clasps

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'firmly hold 150 snakes' is the definition.
I can't tell whether this definition defines the answer.

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

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
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