Penalty leads to striker showing extra skill (7)
I believe the answer is:
finesse
'skill' is the definition.
(I've seen this before)
'penalty leads to striker showing extra' is the wordplay.
'penalty' becomes 'fine' (a financial penalty).
'leads to' says to take the initial letters.
The initial letters of 'striker showing extra' is 'sse'.
'fine'+'sse'='FINESSE'
(Other definitions for finesse that I've seen before include "Subtlety of contrivance in cards" , "Delicate manipulation of a situation - perhaps at cards" , "Delicate manipulation, perhaps in card game" , "Delicate handling of a situation" , "Hopeful ploy at cards" .)