Lie about Conservative leader's policy (7)
I believe the answer is:
recline
'lie' is the definition.
(I've seen this before)
'about conservative leader's policy' is the wordplay.
'about' becomes 're' (regarding**).
'leader' indicates taking the first letters.
'policy' becomes 'line' (I've seen this before).
The initial letter of 'conservative' is 'c'.
're'+'c'+'line'='RECLINE'
(Other definitions for recline that I've seen before include "Lounge" , "sit back ..." , "Assume horizontal or leaning position as for rest" , "Adopt horizontal or leaning position" , "Lean back, relax" .)