The last word on it and youth leader's facility (7)
I believe the answer is:
amenity
'facility' is the definition.
(thesaurus)
'the last word on it and youth leader's' is the wordplay.
'the last word' becomes 'amen' (I've seen this before).
'on' says to put letters next to each other.
'and' says to put letters next to each other.
'youth leader' becomes 'y' (I've seen this in other clues).
'amen'+'it'+'y'='AMENITY'
(Other definitions for amenity that I've seen before include "Pleasing feature (of a place or building)" , "Feature that makes life pleasant or convenient" , "Feature of place that makes living pleasant and convenient" , "This useful service" , "Anytime (anag.)" .)