Most are recycling one sort of plastic (7)
I believe the answer is:
maestro
'one sort of plastic' is the definition.
(type of debit card)
'most are recycling' is the wordplay.
'recycling' is an anagram indicator.
'most'+'are'='mostare'
'mostare' is an anagram of 'MAESTRO'.
(Other definitions for maestro that I've seen before include "Virtuoso" , "Some art (anag.)" , "Accomplished musician" , "Expert musician" , "Master of an art, or a great conductor of music" .)