Sport enthusiast impedes international — someone very young (6)
I believe the answer is:
infant
'young' is the definition.
(similar in meaning)
'sport enthusiast impedes international someone' is the wordplay.
I cannot quite see how this works, but
'enthusiast' could be 'fan' (fan is a kind of enthusiast) and 'fan' is located in the answer.
'international' could be 'int' (abbreviation for international) and 'int' is found in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'very' acts as a link.
Can you help me to learn more?
(Other definitions for infant that I've seen before include "Juvenile" , "Very young child or baby" , "Very small child" , "Young kid" , "Small baby" .)