clear sailing

NOUN /klir_'seɪlɪŋ/
13 LETTERS · STARTS WITH C

clear sailing is a valid 13-letter word worth 15 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3L1E1A1R1S1A1I1L1I1N1G2
3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 2 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does clear sailing mean?