Warm when feeding little one (5)
I believe the answer is:
toast
'warm' is the definition.
(I've seen this before)
'when feeding little one' is the wordplay.
'when' becomes 'as'.
'feeding' means one lot of letters goes inside another.
'little one' becomes 'tot'.
'as' going into 'tot' is 'TOAST'.
(Other definitions for toast that I've seen before include "person much admired" , "making this pledge?" , "Drink one's health" , "It may be eaten (or drunk!)" , "Tribute (plus a clinking of glasses?)" .)