Liberal in leather potentially sane (3,5)
I believe the answer is:
all there
'sane' is the definition.
(I've seen this in another clue)
'liberal in leather potentially' is the wordplay.
'liberal' becomes 'l' (abbreviation).
'in' indicates putting letters inside.
'potentially' is an anagram indicator (letters have the potential to spell a new word).
'leather' is an anagram of 'althere'.
'l' put into 'althere' is 'ALL THERE'.
(Other definitions for all there that I've seen before include "Nothing lacking, perfectly sane" , "Total number of people attending" , "mentally alert" , "Sane - none missing?" , "Not stupid (informal)" .)