A 51 - 45 win is good news for Clinton. But it doesn't translate into a big advantage in delegates. There are 33 from Nevada:
Sixteen of the 25 delegates are allocated proportionally to presidential candidates based on the support for the candidates in each of the state’s three Congressional districts. Nine delegates are allocated to candidates based on the support among all of the delegates attending the convention. The remaining eight unpledged delegates are chosen from party leaders.