That girl's gloves, we hear they've become separated (7)
I believe the answer is:
Here is my best explanation:
'they've become separated' is the definition.
'that girl's gloves we hear' is the subsidiary indication.
I cannot really see how this works, but
'girl' could be 'her' and 'her' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for hermits that I've seen before include "People who live in solitude", "They retire from society for religious reasons", "Solitary dwellers" and "They live in solitude for religious reasons".)