Guide Penny away from drug dealer (5)
I believe the answer is:
usher
'guide' is the definition.
(an usher guides people)
'penny away from drug dealer' is the wordplay.
'penny' becomes 'p' (short for pence).
'away from' suggests deleting specific letters.
'drug dealer' becomes 'pusher' (someone who sells or pushes drugs).
'pusher' with 'p' removed is 'USHER'.
(Other definitions for usher that I've seen before include "Minor court official" , "Doorkeeper, escort" , "Guide at wedding" , "Person showing one to a seat" , "Official doorkeeper or guide" .)