Yes, PANDERER is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, N 1, D 2, E 1, R 1, E 1, R 1.

Is it a valid word?

PANDERER is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

someone who procures customers for whores (in England they call a pimp a ponce)
a person who serves or caters to the vulgar passions or plans of others (especially in order to make money)

Also: fancy man.

Not playable in Scrabble US: PANDAR.