In with (5)
'in with' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for among that I've seen before include "Included with - inside" , "In the midst of (others)" , "Surrounded by" , "Go man! (anag.)" , "Amid" .)
(Other definitions for amongst that I've seen before include "Within the group of" , "Amid" , "Famous novel by John McGahern: '... Women'" , "In the middle of two or more" , "Together with" .)