Allow some price deduction (4)
I believe the answer is:
cede
'allow' is the definition.
(I've seen this before)
'some price deduction' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'CEDE' is hidden in the letters of 'price deduction'.
(Other definitions for cede that I've seen before include "Yield formally" , "Surrender or relinquish possession" , "Surrender or grant" , "Give up (eg, power)" , "Surrender, give up" .)