Lower pile included by Conservative with directions (7)
I believe the answer is:
cheapen
'lower' is the definition.
(I've seen this before)
'pile included by conservative with directions' is the wordplay.
'pile' becomes 'heap' (synonyms).
'included by' indicates putting letters inside.
'conservative' becomes 'C' (UK political abbreviation).
'with' means one lot of letters go next to another.
'directions' becomes 'en' (east and north).
'c'+'en'='cen'
'heap' inserted inside 'cen' is 'CHEAPEN'.
(Other definitions for cheapen that I've seen before include "Reduce the price of" , "Demean - make less expensive" , "decrease in value" , "Tried" , "Decry or devalue" .)