Nibble starter of naan put in fire (5)
I believe the answer is:
snack
'nibble' is the definition.
(I've seen this in another clue)
'starter of naan put in fire' is the wordplay.
'starter of' says to take the initial letters.
'put in' indicates putting letters inside.
'fire' becomes 'sack' (dismiss someone from their job).
The first letter of 'naan' is 'n'.
'n' going inside 'sack' is 'SNACK'.
(Other definitions for snack that I've seen before include "(Eat) a light meal" , "Elevenses?" , "Light bite" , "fast food" , "Small or huried meal" .)