Ascending a Staircase
This page is the CodyCross answer for the clue below from Airport, Group 445, Puzzle 1 (Travel Agent).
Question is: Ascending a Staircase
and the answer is: CLIMBING
Word Meaning:
CLIMBING — (uncountable) The sport of climbing, ascending a wall or a rock or another object using available holds, generally with the safety of a rope and belayer.
Definitions from Wiktionary.