Lozenge in father's drawer ending on tongue (8)
I believe the answer is:
pastille
'lozenge' is the definition.
(I know that pastille is a type of lozenge)
'father's drawer ending on tongue' is the wordplay.
'father's' becomes 'pa's' (pa can mean dad or father).
'drawer' becomes 'till' (I've seen this before).
'ending on' indicates one should take the final letters.
The final letter of 'tongue' is 'e'.
'pas'+'till'+'e'='PASTILLE'
'in' acts as a link.
(Other definitions for pastille that I've seen before include "Lozenge, small sweet for sucking" , "One medicated sweet is the alternative" , "something for a sore throat" , "tablet" , "Flavoured sweet for sucking" .)