Give a summary of unpopular policy (7)
I believe the answer is:
outline
'give a summary of' is the definition.
(I've seen this before)
'unpopular policy' is the wordplay.
'unpopular' becomes 'out' (similar in meaning).
'policy' becomes 'line' (the party line is a party's policy on something).
'out'+'line'='OUTLINE'
(Other definitions for outline that I've seen before include "Plan with little detail" , "Preliminary plan or summary of main points" , "Give a summary of" , "(Give) schematic account" , "Draft plan - indicator of shape" .)