Crossword Genius

To give extra training increases what sportsman bags (7)

Ross

I believe the answer is:

upskill

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'increases what sportsman bags' is the definition.
I know nothing about this answer so I can't judge whether this works.

'to give extra training' is the wordplay.
'to give extra' becomes 'up' (I can't justify this - if you can you should believe this answer much more).
'training' becomes 'skill' (someone with a skill has undergone training).
'up'+'skill'='UPSKILL'

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I've seen this clue in The Guardian.
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