Reliably and interminably flexible? (7)
I believe the answer is:
liberal
'flexible?' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for liberal that I've seen before include "Permissive about Braille" , "Generous, like a British political party" , "open to new ideas" , "Broad-minded in Braille" , "magnanimous" .)