He may be bent on catching a big fish (3)

I believe the answer is:

rod

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'he' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for rod that I've seen before include "Baton, pole" , "Spare it and spoil the child, they used to say" , "Old saying 'Spare the . . . and spoil the child'" , "Flexible stick for 11 Down" , "something fisherman brings home" .)

I've seen this clue in the Evening Standard.

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