Conk broken by my duck (2,5)
I believe the answer is:
no score
'duck' is the definition.
(duck means no score in cricket)
'conk broken by my' is the wordplay.
'conk' becomes 'nose' (I've seen this before).
'broken by' is an insertion indicator.
'my' becomes 'cor' (both are expressions of surprise).
'nose' placed around 'cor' is 'NO SCORE'.
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