A dance it takes a clever fellow to run (7)
I believe the answer is:
foxtrot
'a dance' is the definition.
(foxtrot is a kind of dance)
'a clever fellow to run' is the wordplay.
'a clever fellow' becomes 'fox' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to run' becomes 'trot' (trotting is a kind of running).
'fox'+'trot'='FOXTROT'
'it takes' is the link.
Can you help me to learn more?
(Other definitions for foxtrot that I've seen before include "Lively ballroom dance" , "Ballroom dance in quadruple time" .)