Feel sorry about government disowning Liberal (3)
I believe the answer is:
rue
'feel sorry about' is the definition.
(I've seen this in another clue)
'government disowning liberal' is the wordplay.
'government' becomes 'rule' (rule can mean government or control).
'disowning' indicates named letters should be taken away.
'liberal' becomes 'l' (abbreviation).
'rule' with 'l' removed is 'RUE'.
(Other definitions for rue that I've seen before include "Fish eggs" , "Deplore" , "Repentant sort of shrub?" , "Plant producing oil" , "Regret, be sorry for" .)