Pam struggled in the current (3)
I believe the answer is:
amp
'the current' is the definition.
(electricity)
'pam struggled' is the wordplay.
'struggled' indicates an anagram (I've seen 'struggles' mean this).
'pam' with letters rearranged gives 'AMP'.
'in' acts as a link.
(Other definitions for amp that I've seen before include "In short, unit for measuring electric current" , "Current measure" , "Certain amount of power" , "Unit of electric current - short version" , "sound is increased by this" .)