With Dicky, one could be left in it (4)

I believe the answer is:

will

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'one could be left in it' is the definition.
I can't judge whether this defines the answer.

'with dicky' is the wordplay.
'with' becomes 'w' (short for with).
'dicky' becomes 'ill' (I've seen this before).
'w'+'ill'='WILL'

Can you help me to learn more?

(Other definitions for will that I've seen before include "Volition" , "Intention; legal document" , "Intend; document" , "Intention; bequeath" , "self-control" .)

I've seen this clue in The Guardian.

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