Folding seat below acceptable rank (5)
I believe the answer is:
caste
'rank' is the definition.
(I've seen this in another clue)
'folding seat below acceptable' is the wordplay.
I cannot quite see how this works, but
an anagram of 'seat' is 'aste' which is located in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for caste that I've seen before include "Hereditary social class in Hindu society" , "Social order" , "Social position" , "Religious or social class" , "Brahmans for instance" .)