One who takes a nap with fish? (6)
I believe the answer is:
kipper
'fish?' is the definition.
(type of fish)
'one who takes a nap' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is found within the answer.
This explanation may well be incorrect...
'with' acts as a link.
Can you help me to learn more?
(Other definitions for kipper that I've seen before include "One not awake" , "has been caught napping" , "Smoked split herring" , "One drops off" , "Preserved herring" .)