Hindu instructor moved through water against current (5)
I believe the answer is:
swami
'hindu instructor' is the definition.
(a teacher in Hinduism)
'moved through water against current' is the wordplay.
'moved through water' becomes 'swam' (I've seen this before).
'against' means one lot of letters go next to another.
'current' becomes 'i' (symbol for electric current).
'swam'+'i'='SWAMI'
(Other definitions for swami that I've seen before include "How to address Hindu dignitary" , "Term of respect to a Hindu teacher" , "Guru" , "Religious leader" , "Indian religious teacher" .)