Mollycoddle lettuce group (6)
I believe the answer is:
cosset
'mollycoddle' is the definition.
(I know that mollycoddle can be written as cosset)
'lettuce group' is the wordplay.
'lettuce' becomes 'cos' (cos lettuce is a kind of lettuce).
'group' becomes 'set' (both can mean a collection).
'cos'+'set'='COSSET'
(Other definitions for cosset that I've seen before include "Treat with excessive indulgence" , "Feather-bed" , "Baby" , "Treat indulgently, pamper" , "Care for overindulgently" .)