Is ridiculously sexist (6)
I believe the answer is:
exists
'is' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?
'ridiculously sexist' is the wordplay.
'ridiculously' indicates an anagram (I've seen this in other clues).
'sexist' with letters rearranged gives 'EXISTS'.
Can you help me to learn more?
(Other definitions for exists that I've seen before include "Lives" , "Has life" , "Is present in the universe" , "Subsists" , "Has being, is actual" .)