Is coming back holding (left hand) the ring and sliding! (10)

'sliding' is the definition.
('slither' can be a synonym of 'slide')

'is coming back holding left hand the ring' is the wordplay.
'coming back' shows that the letters should be reversed in order.
'holding' indicates putting letters inside.
'left hand' becomes 'l' (abbreviation for left, as in the left-hand side. I am not sure about the 'left' bit.).
'is' backwards is 'si'.
'si' placed around 'l' is 'sli'.
'sli'+'the'+'ring'='SLITHERING'

'and' is the link.

Can you help me to learn more?