Left inside edge (5)

I believe the answer is:

sidle

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'left inside edge' is the definition.
'sidle' can be an answer for 'edge' (I've seen this in another clue). I am not sure about the 'left inside' bit.

'left inside edge' is the wordplay.
'left' becomes 'l' (common abbreviation).
'inside' is an insertion indicator.
'edge' becomes 'side' (edge can mean the side of something).
'l' inserted inside 'side' is 'SIDLE'.

Can you help me to learn more?

(Other definitions for sidle that I've seen before include "Walk sideways like crab" , "Walk furtively sideways" , "Edge along laterally" , "Walk crabwise" , "Inch along" .)

I've seen this clue in the Evening Standard.

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