Impromptu remark from Democrat cornered by a Liberal (2-3)
I believe the answer is:
ad-lib
'impromptu remark' is the definition.
(I've seen this before)
'democrat cornered by a liberal' is the wordplay.
'democrat' becomes 'd'.
'cornered by' is an insertion indicator (I've seen this in other clues).
'liberal' becomes 'lib'.
'a'+'lib'='alib'
'd' inserted into 'alib' is 'AD-LIB'.
'from' is the link.
(Other definitions for ad-lib that I've seen before include "Speak impromptu" , "Improvise" , "Extemporise" , "freely" , "Speak without preparation" .)