Forgetting name, ring doctor (3)
I believe the answer is:
rig
'doctor' is the definition.
(both can mean to forge or manipulate)
'forgetting name ring' is the wordplay.
'forgetting' suggests deleting specific letters.
'name' becomes 'n' (common abbreviation e.g. on forms).
'ring' with 'n' taken away is 'RIG'.
(Other definitions for rig that I've seen before include "uniform perhaps" , "Provide with clothes - for oil well?" , "Masts, spars and sails on a vessel" , "Large American lorry" , "Apparatus; outfit" .)