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Possible pointer as to how to work on a plot (5)

Ross

I believe the answer is:

digit

I'm a little stuck... Click here to teach me more about this clue!

'possible pointer' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'to how to work on a plot' is the wordplay.
I cannot quite see how this works, but
'work' could be 'dig' (digging is a kind of working) and 'dig' is located in the answer.
The remaining letters 'it' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'as' is the link.

Can you help me to learn more?

(Other definitions for digit that I've seen before include "Finger; number" , "One in ten, say" , "one's given?" , "Need a bit of a hand" , "A character" .)

I've seen this clue in the Evening Standard.
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