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Where bowler for example hits the ground immediately? (2,3,4,2,1,3)

Ross

I believe the answer is:

at the drop of a hat

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'immediately?' is the definition.
(I've seen this in another clue)

'where bowler for example hits the ground' is the wordplay.
I cannot really understand how this works, but
'bowler' could be 'hat' (bowler is a type of hat) and 'hat' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for at the drop of a hat that I've seen before include "in no time at all" , "When pork pie downed" , "When a tile descends" , "Immediately" , "When a tile falls to the ground" .)

I've seen this clue in The Telegraph.
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