Meal produced by one grandmother — little girl tucks in (6)
I believe the answer is:
indian
'meal' is the definition.
(Indian meal is an example)
'one grandmother little girl tucks in' is the wordplay.
'one' becomes 'i' (Roman numeral).
'grandmother' becomes 'nan' (nan can informally mean a grandmother).
'little girl' becomes 'Di' (short for Diane, Diana etc).
'tucks in' indicates putting letters inside.
'nan' enclosing 'di' is 'ndian'.
'i'+'ndian'='INDIAN'
'produced by' acts as a link.
(Other definitions for indian that I've seen before include "National" , "One from the sub-continent" , "Delhi native perhaps" , "Native of North America" , "Relating to Asian subcontinent" .)