Yes, HEDGER is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, D 2, G 2, E 1, R 1.

Is it a valid word?

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

a respondent who avoids giving a clear direct answer
someone who counterbalances one transaction (as a bet) against another in order to protect against loss
a gardener who takes care of and trims hedges