European runner collects outstanding coat this makes fit (6,7)
I believe the answer is:
rowing machine
'this makes fit' is the definition.
(machine which might make the user fit)
'european runner collects outstanding coat' is the wordplay.
'european runner' becomes 'rhine' (European river, something which runs).
'collects' means one lot of letters goes inside another.
'outstanding' becomes 'owing' (synonyms).
'coat' becomes 'mac' (mac is a kind of coat).
'owing'+'mac'='owingmac'
'rhine' enclosing 'owingmac' is 'ROWING MACHINE'.
(Other definitions for rowing machine that I've seen before include "Device for exercise" , "Item of gym equipment" , "exercise apparatus" .)