Answer: ally

AnswerCrossword Clue
ALLYJoin forces
ALLYAssociate
ALLYFriend
ALLYFriend in war
ALLYTreaty co-signer, often
ALLYTreaty signer
ALLYCoalition member
ALLYWartime supporter
ALLYPact partner
ALLYTreaty partner
ALLYColleague in combat
ALLYEntente member
ALLYOne who's with you
ALLYPolitical pal
ALLYGet together (with)
ALLYOne working with you
ALLYPartner
ALLYShe has your back
ALLYFriend in war or peace
ALLYTV's McBeal
allyperson, nation, etc., bound to another, as by a treaty
ALLYMcBeal on the tube
ALLYAlign
ALLYBand together
ALLYFriendly associate
ALLYFriend in Risk or Diplomacy
ALLYStraight ... (PFLAG member, e.g.)
ALLYComrade in arms
ALLYSupporter
ALLYPartisan
ALLYFoe's foe
ALLYConfederate
ALLYSheedy on screen
ALLYOne in your corner
ALLYFriend, not foe
ALLYCompatriot
ALLYPartner in crime
ALLYOne on your side
ALLYFormal friend
ALLYRussia, to WWII America