Clues starting with O 18 clues

Occupies all the space in something 5 letters
Of a plant, to develop a seed or fruit 3 letters
Of shoelaces: not fastened, not knotted 6 letters
__ of the tiger, it's the thrill of the fight! 3 letters
Offers money at an auction 4 letters
Officer in charge for short 3 letters
"Old __ have long shadows" 4 letters
Old-fashioned term meaning "make a mistake" 3 letters
"On __ and needles" 4 letters
On a Mac, it's the option key 3 letters
On your own 5 letters
One ball of a pair in a weapon 4 letters
One of the Bs of ABBA 5 letters
Onomatopoeic sound of a snake 3 letters
Opens an orange or a banana 5 letters
Organisms studied by a bryologist 6 letters
Overly touristy spot designed to pull in crowds 4 letters
Oxygen, hydrogen and methane 5 letters