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Fielder’s hand crossing rope initially by mistake (5,4)

Ross

I believe the answer is:

first slip

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'mistake' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'fielder's hand crossing rope initially by' is the wordplay.
'fielder' becomes 'slip'.
'hand' becomes 'fist' (fist is a kind of hand).
'crossing' indicates putting letters inside.
'initially' says to take the initial letters.
'by' is a charade indicator (letters next to each other).
The initial letter of 'rope' is 'r'.
'fist' placed around 'r' is 'first'.
'slip' put after 'first' is 'FIRST SLIP'.

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(Another definition for first slip that I've seen is " could catch you out".)

I've seen this clue in The Hindu.
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