Jama is the boss at Gower
Melville needed an 83rd minute penalty to beat ninth-placed Ellerslie at Gower Park and retain a five-point lead at the top of the northern league first division.
Jama Boss took his goal tally to 13 from nine matches, including the late penalty.
He had earlier given Melville a 19th minute lead from close range, but Ellerslie struck back three minutes later from Josh Torrens following a free kick.
Melville dominated possession but a committed Ellerslie team were hard to break down.
Coaches named Boss as their player of the day along with defender Luke Searle.
Meanwhile Melville Reserves failed to convert a penalty as they lost 1-3 to Ellerslie.
Melville are at home to Tauranga on Saturday.