This uses reversal - look for an indicator word that suggests turning around, going back, or returning something.
'Returning' is the reversal indicator - you need to reverse the letters that spell 'skins again'. Think of a word meaning 'skins again' (as in peeling repeatedly), then write it backwards.
Answer: SLEEPER | 'Skins again' = RE-PEELS, and 'returning' indicates reversal, so RE-PEELS backwards gives SLEEPER (railway support that holds up the line)