Bell's taken on cricket shot, opener (4,4)
I believe the answer is:
ring pull
'opener' is the definition.
(means of opening a can)
'bell's taken on cricket shot' is the wordplay.
'bell' becomes 'ring' (to give someone a bell is to ring them on a phone).
'taken on cricket shot' becomes 'pull' (I can't justify this - if you can you should believe this answer much more).
'ring'+'pull'='RING-PULL'
Can you help me to learn more?
(Other definitions for ring pull that I've seen before include "How to get at coke" , "Can opener" , "Part of a beer can" , "Can-opener" .)