Give one better way to level playing field (8)
I believe the answer is:
handicap
'way to level playing field' is the definition.
(way of levelling the playing field in golf)
'give one better' is the wordplay.
'give' becomes 'hand' (synonyms).
'one' becomes 'I' (Roman numeral).
'better' becomes 'cap' (I've seen this before).
'hand'+'i'+'cap'='HANDICAP'
(Other definitions for handicap that I've seen before include "golfer's measure of skill" , "Hold back" , "Place at a disadvantage" , "Disadvantage to offset an advantage in golf" , "Block" .)