In spare time, read about hermit (7)
I believe the answer is:
eremite
'hermit' is the definition.
(thesaurus)
'in spare time read about' is the wordplay.
'in' indicates the answer is hidden within the clue.
'about' is a reversal indicator.
'etimere' is hidden within 'spare time read'.
'etimere' backwards is 'EREMITE'.
(Other definitions for eremite that I've seen before include "Solitary" , "ascetic" , "desert father" , "Christian living in severe circumstances" , "Religious type" .)