Having any time free is a convenience (7)
I believe the answer is:
amenity
'convenience' is the definition.
(I've seen this in another clue)
'having any time free' is the wordplay.
'any time' anagrams to 'AMENITY'.
However, I'm unsure how this is indicated.
'is a' acts as a link.
Can you help me to learn more?
(Other definitions for amenity that I've seen before include "Any time for convenience or pleasentness" , "Pleasing facility" , "Useful feature (of a building/place)" , "Feature that makes life pleasant or convenient" , "Facility serving the public" .)