Many a sportsman's error can cause stoppage! (4)

I believe the answer is:

clog

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'stoppage' is the definition.
(thesaurus)

'many a sportsman's error' is the wordplay.
'many' becomes 'c' (C is the Roman numeral for l00).
'a sportsman's error' becomes 'log' (I can't explain this - if you can you should believe this answer much more).
'c'+'log'='CLOG'

'can cause' is the link.

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(Other definitions for clog that I've seen before include "Block; sabot" , "Become blocked with wooden-soled shoe" , "Block with wooden-soled shoe?" , "Jam" , "Wooden footwear" .)

I've seen this clue in the Evening Standard.

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