It’s singularly handy for rowing (5)

I believe the answer is:

scull

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'rowing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

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

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(Other definitions for scull that I've seen before include "Small oar" , "Blade" , "A single oar" , "racing shell" , "Row with two oars" .)

I've seen this clue in the Evening Standard.

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