Ignoring cold, mountaineer is able to move freely (6)
I believe the answer is:
limber
'able to move freely' is the definition.
I can't tell whether this defines the answer.
'ignoring cold mountaineer' is the wordplay.
'ignoring' indicates named letters should be taken away.
'cold' becomes 'c' (eg on taps).
'mountaineer' becomes 'climber' (I've seen this before).
'climber' with 'c' taken out is 'LIMBER'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for limber that I've seen before include "Supple; flexible" , "Able to move supply" , "Agile, supple" , "easily bent" , "Agile and flexible" .)