Grass in Foreign Office getting money for liberty (7)
I believe the answer is:
freedom
'for liberty' is the definition.
(I've seen this before)
'grass in foreign office getting money' is the wordplay.
'grass' becomes 'reed' (type of grass plant).
'in' means one lot of letters goes inside another.
'foreign office' becomes 'FO' (abbreviation).
'getting' is a charade indicator (letters next to each other).
'money' becomes 'm' (abbreviation used in economics).
'reed' inserted inside 'fo' is 'freedo'.
'freedo'+'m'='FREEDOM'
(Other definitions for freedom that I've seen before include "Autonomy" , "novel" , "Release" , "Liberty, civil liberty" , "outspokenness" .)