Pam struggled in some current (3)

I believe the answer is:

amp

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'some current' is the definition.
(unit of electrical current)

'pam struggled' is the wordplay.
'pam' anagrams to 'AMP'.
However, I'm not clear how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for amp that I've seen before include "Map of electrical unit" , "Map of electric current" , "It helps you hear" , "Sound booster" , "Current measure" .)

I've seen this clue in The Mirror.

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