Idle group, those without pity endlessly taking second hour off (3,6)

'idle group those without pity endlessly' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'second hour off' is the wordplay.
I cannot quite see how this works, but
'second' could be 's' (common abbreviation) and 's' is found within the answer.
'hour' could be 'h' and 'h' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'taking' is the link.

Can you help me to learn more?