Picks active particle with no current (7)
I believe the answer is:
plectra
'picks' is the definition.
('plectrum' can be a synonym of 'pick')
'active particle with no current' is the wordplay.
'active' indicates anagramming the letters (the letters are active/moving).
'with no' indicates named letters should be taken away.
'current' becomes 'I' (symbol for electric current).
'particle' with 'i' taken out is 'partcle'.
'partcle' is an anagram of 'PLECTRA'.
(Other definitions for plectra that I've seen before include "Guitar pickers - carp let (anag)" , "Guitar plucking aids" , "Plucky types" , "Bits of plastic maybe" , "Parts for harpsichord" .)