Current makers of maps (4)
I believe the answer is:
amps
'current' is the definition.
(I've seen this before)
'makers of maps' is the wordplay.
'maps' can be anagrammed to 'AMPS'.
Though, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for amps that I've seen before include "Current measures" , "'Units of electric current, in short (4)'" , "Basic units of electric current" , "Units of electrical power" , "concert gear" .)