Oddly, skivers are claiming time for afternoon nap! (6)
I believe the answer is:
siesta
'afternoon nap' is the definition.
(Spanish term for an afternoon nap)
'oddly skivers are claiming time' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'are' becomes 'a' (short for 'are', historical unit of measurement).
'claiming' indicates putting letters inside.
'time' becomes 't' (abbreviation).
The alternate letters of 'skivers' are 'sies'.
'sies'+'a'='siesa'
'siesa' going around 't' is 'SIESTA'.
'for' acts as a link.
(Other definitions for siesta that I've seen before include "Forty winks" , "A mid-day nap in Spain" , "Catnap" , "Afternoon rest" , "Daytime nap" .)