Pam struggles in current? (3)
I believe the answer is:
amp
'current' is the definition.
(electricity)
'pam struggles' is the wordplay.
'struggles' indicates anagramming the letters.
'pam' with letters rearranged gives 'AMP'.
'in' acts as a link.
(Other definitions for amp that I've seen before include "Certain amount of power" , "Physics unit" , "Current measure" , "Map of electrical unit" , "Current; hi-fi kit" .)