One following round for each amateur (8)
I believe the answer is:
inexpert
'amateur' is the definition.
(I've seen this before)
'one following round for each' is the wordplay.
'one' becomes 'i' (Roman numeral).
'following' becomes 'next' (synonyms).
'round' indicates putting letters inside.
'for each' becomes 'per' (per person).
'next' placed around 'per' is 'nexpert'.
'i'+'nexpert'='INEXPERT'
(Other definitions for inexpert that I've seen before include "Incompetent" , "Bungling" , "Green" , "non-professional" , "not clever" .)