Coat caught to that extent by blow (7)

I believe the answer is:

cassock

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'coat' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'caught to that extent by blow' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'to that extent' becomes 'as' (I've seen this in other clues).
'by blow' becomes 'sock' (I've seen this in another clue. I am not sure about the 'by' bit.).
'c'+'as'+'sock'='CASSOCK'

Can you help me to learn more?

(Other definitions for cassock that I've seen before include "Vestment" , "Clergyman's gown" , "Chorister's robe" , "Full-length garment for Christian clergy or choir" , "Long clerical robe" .)

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

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