Return at one ten, prepared to take a break (8)
I believe the answer is:
interest
'return' is the definition.
(I've seen this before)
'one ten prepared to take a break' is the wordplay.
'one' becomes 'i' (Roman numeral).
'prepared' is an anagram indicator.
'to take a break' becomes 'rest' (to have a rest is to take a break).
'ten' with letters rearranged gives 'nte'.
'i'+'nte'+'rest'='INTEREST'
'at' acts as a link.
(Other definitions for interest that I've seen before include "Curiosity or concern, or a financial stake in (8)" , "Sum paid on a loan" , "Gain - attention" , "Concern - money accruing" , "Diversion" .)