Frank makes some spare time (5)
I believe the answer is:
overt
'frank' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?
'some spare time' is the wordplay.
'some spare' becomes 'over' (I am not sure about this - if you are sure you should believe this answer much more).
'time' becomes 't' (abbreviation).
'over'+'t'='OVERT'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for overt that I've seen before include "Open, not secret or hidden" , "Conspicuous" , "Done in an obvious way" , "Open,up front" , "totally visible" .)