Stay with leader of group in ship (6)
I believe the answer is:
linger
'stay' is the definition.
(I know that linger is a more specific form of stay)
'leader of group in ship' is the wordplay.
'leader of' indicates taking the first letters.
'in' indicates putting letters inside.
'ship' becomes 'liner' (as in an ocean liner).
The initial letter of 'group' is 'g'.
'g' put within 'liner' is 'LINGER'.
'with' is the link.
(Other definitions for linger that I've seen before include "Delay departure" , "Procrastinate" , "Hang about, don't be in a hurry to go" , "Remain for long" , "Remain behind" .)