Favourably compares looks during a power-out? (5,1,6,2)

'favourably compares looks during' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'a power-out?' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
'power' could be 'hold' (hold is a kind of power) and 'hold' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?